I can't remember if there is a number of posts you need to reach before posting any photos. If so, the fastest way to increase the number is to leave comments on photos in the gallery. Here are quite a few scrapbook pages for a May challenge that you may be interested in seeing to leave comments on scrapbooking items of interest to you:
Gallery at Splitcoaststampers
Try to post a photo and see if it works. If not, increase your number of posts.