Check the latest version and download

wget http://download.webmin.com/download/yum/webmin-1.690-1.noarch.rpm

Install the RPM file of Webmin with the following command:

rpm -Uvh webmin-1.690-1.noarch.rpm

Turn off the firewall

/sbin/rcSuSEfirewall2 stop

Do access http://OpenSuse-IP:10000/

Do all necessary setting using Webmin