Installing webmin on centOS using yum

create a file /etc/yum.repos.d/webmin.repo

[Webmin]

name=Webmin Distribution Neutral

#baseurl=http://download.webmin.com/download/yum

mirrorlist=http://download.webmin.com/download/yum/mirrorlist
enabled=1

paste the above content into the new file.
save the file.

Now enter "yum install webmin"

You are done