Can I upload pictures? Where do they show up?

If you're a registered user of the site, yes, you can upload picture files and show them in galleries you create.

Once logged in, you can create any number of galleries by choosing from the side menu Your Galleries | New personal gallery. Then, you can upload picture files and associate them to the galleries you've created by choosing Your Galleries | New photos. By making a gallery a "Featured" gallery, the photos in it will show up in the "Featured Photo" area of the website.