Install dependencies before we proceed to install webmin
[root@testbed ~]# yum -y install perl-Net-SSLeay
Download latest rpm package from Webmin’s official website
[root@testbed ~]# http://www.webmin.com/download/rpm/webmin-current.rpm -O /tmp/webmin.rpm
Once it is downloaded, install the RPM using the following command
[root@testbed ~]# rpm -i /tmp/webmin.rpm
No more steps required. Its installed 
Go to your browser and access the control panel with valid ssh credentials.
Default URL is https://your-ip:10000/ (IF you have not changed the default port)