yes, you have to configurate not only where to get software UPDATES but all software available.
Do this: under Yast2 go on Installation Source
Add a softwareserver
UPDATE servers are here (I think this is what you yet have)
SOFTWARE servers have the repository
add a server of your country to avoid long download times.
You may then update every package going into Yast2 - Online Update. Check the update and the "Autocheck" button.