Formatting changes made to this site

For the longest time, I've been wanting to add a third column to this site. But I've been dragging my heels because I didn't even know where to begin. I did a search and came across this site. What a great resource for blogger users!

Now all I need to do, is figure out how to remove those darned underlines from the links and I'm set! I've tried adding the code below between the heads, but it just isn't working... Any thoughts?