Emerson613: when you go to the gallery, you see at the right 'upload photo'. Just hit it and you'll see the upload screen. First thing is to choose the gallry. Hit the triangle for the drop down menu. Second will be 'weekly challenges', richt under member gallery. Just follow all the instructions, make sure you added the title and credits before hitting the submit button! Hope this helps you out! Can't wait to see you page.
Oh, and after uploading your pic, right under it you'll see 3 kind of links. To have it shown in this thread, hit the second link, it becomes blue immediately, just copy it and paste it here and in the appropiate forum (so if your layout is about the castle, put it in the thread about the castle, make sure you put in at the right park!).
If you need more help, don't hesitate to shout, there are so many helpful girls/guys out there, I'm sure someone could help you through!
Don't forget to have fun, too!