Which box are you using? I tested access channels from the EPG, and if you select a channel by clicking OK, or via a mouse on the EPG or the small video picture, you should get a menu to Play, Add (or Remove) From Favorite, and Close.... worked fine from the T3 box and Buzz TV.
I don't have doubts on your skills but try again and make sure courser is in middle of picture on top right corner and press ok button and should work.