You're not stupid!
It's kinda like ebay. You create an account, post an item for 10 cents, and then sellers buy your wares. Upside is that your listing stays active for 6 months and there's no bidding, so you get the amt of money you want for your item. THey only take out about 3% commission, not ebay's 5%. It is also simple to use their shopping cart and connects so many crafty sellers together. Hope that helps!