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Certain m'ont fait part de l'impossibilité d'installer Webmin via Yum, il vous reste donc la solution de l'installer via les RPM ou via les sources, il n'y a rien de bien  compliqué, voici une copie de la page d'installation que vous pouvez trouver sur le site officiel de webmin

Downloading and Installing   

The current Webmin distribution is available in various package formats for download from:

webmin-1.270.tar.gz (Unix tar/gzip format, 9235 kB)
webmin-1.270-1.noarch.rpm (RPM suitable for Redhat, Caldera, SuSE, Mandrake or MSC Linux, 10081 kB)
webmin-1.270-1.src.rpm (Source RPM suitable for Redhat, Caldera, SuSE, Mandrake or MSC Linux, 9239 kB)
webmin-1.270.pkg.gz (Solaris package format, 8840 kB)
webmin-1.270.zip (ZIP format suitable for Windows, 12488 kB)
webmin-1.270-minimal.tar.gz (Minimal version of Webmin, Unix tar/gzip format, 1278 kB)


You can also download recent versions of Webmin and all of the ancient releases. You can also view the change log for a list of new features in this version and in older releases.

The PGP key that the RPM packages for versions 1.040 and above were signed with is also available, so that you can verify their integrity. Just add it to your GnuPG or PGP keyring and run the command rpm --checksig webmin-1.270-1.noarch.rpm. If you are using RPM version 4 or above, you will need to import the key into RPM's key database with the command rpm --import jcameron-key.asc. Otherwise, you can run gpg --import jcameron-key.asc as root.

The PGP signature for the latest tar/gzip version of Webmin is also available so that you can verify the tar.gz file with the command gpg --verify webmin-1.270.tar.gz-sig.asc webmin-1.270.tar.gz.

The minimal version of Webmin contains only the core API and programs, and a few modules required for its basic operation. Most modules and all themes have been left out, but can be easily added later. It can be useful if you only need some of the programs functionality, and don't want to download the entire multi-megabyte package. The 1.270 minimal tar.gz distribution can be downloaded from webmin-1.270-minimal.tar.gz

Additional documentation is available to assist with the installation of Webmin and other required packages on the following operating systems : Sun Solaris, HP/UX and Apple MacOS X.


Installing the RPM
If you are using the RPM version of webmin, run the command rpm -U webmin-1.270-1.noarch.rpm and the install will be done automatically to /usr/libexec/webmin, the administration username set to root and the password to your current root password. You should now be able to login to Webmin at the URL http://localhost:10000/ .

Installing the tar.gz file
Before downloading Webmin, you must already have Perl5 installed on your system. Perl is usually installed as /usr/local/bin/perl or /usr/bin/perl, and comes as part of most recent versions of Linux. If you don't have Perl, you can download the source from http://www.perl.com/ and compile it for your system. Most operating systems come with Perl these days, so check your operating system CD or website for a package as well.
When unpacked, the distribution creates a subdirectory called webmin-1.270 under the current directory. Since recent versions of Webmin support installation into a directory of your choice, you can pick a destination directory such as /usr/local/webmin. Then run the following commands in the directory containing the webmin-1.270.tar.gz file :


[root@yourhost /tmp]# gunzip webmin-1.270.tar.gz
[root@yourhost /tmp]# tar xf webmin-1.270.tar
[root@yourhost /tmp]# cd webmin-1.270
[root@yourhost /tmp/webmin-1.270]# ./setup.sh /usr/local/webmin

When the setup.sh script is run, it will ask the following questions :
The Webmin configuration directory
The directory in which all Webmin configuration information is stored. This is now separate from the Webmin install directory, so that configurations are saved when you upgrade.
If you have previously installed Webmin and use the same config directory, this will be the only question asked.

The Webmin log directory
The location for pid and webserver log files.

The full path to perl on your system
This is usually /usr/bin/perl or /usr/local/bin/perl

Your Operating system type
In Webmin versions 0.990 and above, this question is only asked if your operating system cannot be automatically determined.
The setup script will display a list of supported systems. If your OS is not on the list, you can try choosing the closest match. However this may not work properly, and may even cause serious problems!

Web server port
The TCP port that the Webmin web server will listen on.

Web server login and password
The login name and password used to acess the Webmin web server.

Web server hostname
The hostname of the machine on which Webmin will run.

Use SSL
This question will only be asked if your system has the Perl SSL libraries installed. See below for more..

Start Webmin at boot time
If your OS is supported, Webmin will ask if you want to have it automatically started at boot time.

Assuming you answer all the above questions correctly, the Webmin web server will be started and the setup script will give you the URL to go to. Enter this URL into your browser, and you will be prompted for the login and password that you choose in setup.sh. Once you have logged in your browser should show the main Webmin page, on which is an icon for each module you have installed.
If you installed Webmin by specifying an installation directory parameter to setup.sh as the instructions above show, the original webmin-1.270 directory can now be safely deleted.

Source: Webmin.com