Templates

So ALLLLLL day it seems, i have been trying to get a new template for my page. I want to have 3 columns. No matter what i try it is giving me an error messgae :( Frankly it is driving me crazy. I am very persistent and yet it is not paying off. I do not know enough about html stuff to figure it out, usually site just do that for u, but it doesn't seem to be working. HELP!!!