You are making things difficult for yourself (and for us) by mixing all these tools (yast tool + NM + terminal).
First things first: try to bring the connection up on the command line using iwconfig, like this:
iwconfig wlan0 <yourESSID> key off
If this works, ie, the interface wireless access point MAC is displayed using "iwconfig" of "ifconfig", then try to get an IP number:
If you get are assigned an IP number, you should now have a internet connection.
After that, you can start playing with NetworkManager or other tools to try to automate this process, but only after the above works.