HELP!

So this is what happens when you can't sleep and start messing with your blog. Yes, I have been up most of the night with a splitting headache and can't for the life of me fall to sleep. I finally got tired of just laying there. I have hit some button and now I can't get anything back! I don't even have my "design" tab anyone. I'm really hoping some blogging/computer experts can help me...please :(

Sidenote: I somehow got back to where I started messing around, thankfully! But does anyone know how to add a banner from Cutest Blog on the Block? I can't find an HTML code....