Every attraction, show, ride, character, etc has their own thread, and then anyone with a LO of that posts in that thread. This way, if you are looking for inspiration for Small World, you can just go to the Small Workd thread.
Here are some threads that explain how the board works:
http://www.mousescrappers.com/forums...php?f=9538&a=5
http://www.mousescrappers.com/forums...4283#post14283
About your other question, make sure you check "remember me" when you log in.