Lost “Visual” option for posting

I was messing with my theme yesterday and when I went to post I realized that i had lost my “visual” option for posting.

I can’t figure out where it went. Could someone point me in the right direction of where the code is kept? I could do some replacing from my theme package, I just don’t want to have to start over. I’m fairly new at this and had mostly a lot of success yesterday hacking my theme.