No, anybody can make chess puzzles - just click the chess board icon that appears at the top of the box where you enter a comment.

yeah this wasn't so hard hey i didn't know we could make chess puzzles cool lol do you have to be a full member or something?

that was cool though dude got it first try as well

Yay!!!  I finally got a puzzle first try!  I must be getting better!  ;)

The fourth move may be harder to see, but you really need to keep the king contained in order to checkmate...  That move keeps him off the rest of the board.  If you look at checkmates like that, seeing those gets much easier.