Head Rest Seat Clamp Removal

How do I get the seat back off of the headrest clamps on the top of the seat back? Seems that they pull out but it also seems that something is preventing me from pulling them out. Any ideas?

 

Just now seeing this but you have to undo the bottom portion of the back seat cover first, then reach your hand inside and up the back of the seat. The head rest retainers are inside of the metal cylinder and you have to pinch the bottom of the head rest retainer (inside the back of the seat) and lift the out as they're being pinched.

 

Thank you for your help. So simple when you know how, impossible when you don't. So thanks again!