What Have I Done!!!!

I'm typing as fast as I can, PLEASE excuse the crazy mess my blog layout and design is in at the moment. I thought I'd try some things out and now I do not know what I have done or how to un-do them.  The colors and dots, and background!!!! Ugh! EVERYTHING!   I want to jump up and down on my computer, in a full tantrum.  Please know that the awful colors and everything about my layout and design is not want I meant to do and want it changed!!!!!   Now to figure out HOW. I need a "start over" button.