Cakewalk Sound Center

Hy guys, just have one question, I'm new with the Sonar Le program, so can enybody just tell me how can I use my keybord in Cakewalk Sound Center? I have duo-capture, it works fine for ultimate recording, but I would like those sound effects in the Center.
 
If enyone knows how to use it, please help me XD 
thanks <3