Getting Webmin is easy, and in fact, it may already be installed on your system. Several Linux distributions now include Webmin as either its primary system administration interface or as an optional package. Also, a large number of Linux hardware vendors use Webmin or a modified version of Webmin as their graphical administration interface. Best of all, because Webmin is Free Software, even if you don't already have Webmin, it is only a download away.
It is often best to obtain Webmin from your OS vendor if they provide a package for it. In this way, you can be sure it is automatically configured suitably for your particular OS and version. Executable and configuration file locations vary somewhat from OS version to version and from vendor to vendor, so getting Webmin from your vendor insures consistency.
If your OS or system vendor does not provide a package of Webmin, then you can go to the Webmin homepage at: http://www.webmin.com/webmin. Here you will find the latest version of Webmin in a tarball package, a Solaris pkg, and an RPM package. The tarball will work on nearly any Unix version that has Perl, while the RPM package is known to work directly on at least Red Hat, Mandrake, SuSE, MSC and Caldera versions of Linux.