Well, it would be a good idea to start by telling how you actually want to make a network connection.
Is it wired or wireless?
What exact network card/wireless adapter do you have?
Internal or USB?
You can enable NetworkManager in YaST->Network Devices->Network Settings->Global Options (click on the chooser that says “Wicked Service” and switch to “NetworkManager”).
But this won’t help at all if your network card is not even recognized/shown in YaST.