How to add package repositories to Open Suse linux

Here is a simple how to add repositories to a OpenSuse linux.
1) Check what version / release of OpenSuse linux you have:
cat /etc/SuSE-release
2) opensuse -> applications -> system -> administration settings
3) enter admin password and navigate to:
Tab Software -> software repositories
4) click on Add
6) find your appropriate OpenSuse repositories for your OpneSuse Linux version [...]