Welcome! Well, just a few words before you start:

The message boards we offer at this moment are in the left menu. Guestbook is the place for posting messages addressed to us - your opinions, general suggestions, etc. The Questions section is for questions and answers, regarding this site (including those of the form "How...", "Where", or "When will you open/post...") or something else. Discussions of problems is a place for - guess what - discussing problems.

It is by no means a trouble if your post ends up in a "wrong" section, so don't worry about that.