Why can't I post?

The first 3 forums listed in the Welcome Center section (A Word from Steve's, Photo of the Day Contest, Steve's Latest Reviews) do not allow member replies. Otherwise, the sort order would get mixed up (since new posts force threads to go to the top of the list of threads within a specific forum).

The way it's setup now, you can look at the Photo of the Day Contest Forum and see the Winners sorted in date order (it's an information Forum only, not one that's designed for member responses).

Wonderful! Where do the pictures come from if no one can post them?

If you look at any post in the Photo of the Day Contest Forum, all you have to do is click on the winning photo (as the text above every photo in that forum indicates) to visit Steve's Digital Photo of the Day Contest

You'll see a section on the Steve's Digital Photo of the Day Contest page that explains how to e-mail a photo in for consideration (scroll down past the prizes and you'll see it).