The seat posts are what we call Slide-N-Lock system. Should be a flip up style base on the decks. Lift up the flap, and angle your post in, it will drop and then you "slide" in and the flap will flip back down, "locking' it in. Thats about it with them.
Personally. I like the system as it comes off as being Non-cookie cutter type. I think I sent you a IM a few days ago re: this issue and your seats. Check them and see if they got thru.