Notice your running Suse 9.2.
Most apps will have been installed via YaST so just fire up YaST, then to "Software", then "Install and Remove Software".
In the search box type in the name or part name of the software you wish to uninstall and press enter or click search.
The software will appear in right hand column.
Click on the tick box until the option you want appears - refresh/delete/install.
Apps installed outside of YaST or with a newer version may appear with a padlock. You can still click these to uninstall.
YaST should manage any changed dependancies and warn you if uninstalling might damage other apps.
Click Accept to confirm and the rest is done by YaST.