Just wanted to give another thanks to those of you who responded to my SOS earlier!!
Thank you for the hints and advice and I'm happy to say...I figured out how to make my blog with 3 columns. Yay. (everyone clap)
But my blog looks no different and there are only 2 columns, you say? Yes. You can count correctly, don't worry! I did indeed figure out how to make 3 columns. Unfortunately, my pretty background is only set for 2 columns. So until the creators make a 3 column version (or I find another background that I like and so far I have been amazingly unsuccessful) it will stay 2 columns.
But thank you for all the help! I know how to do it now!!