You only have 2 posts to your name. The PM function has not yet been activated for you. See the posts directly before yours, here.
Thanks Simon, it now seems to be active after 2 posts and a thread like! (to be entirely honest I was hoping my original post here would help bolster the tally!)
As a fellow Rookie, did you find an instruction set? How to "save" a specific model forum, how to get posts in chronological order... almost anything!