Please Help! Typing question for Macs.

Hey guys, thanks in advance for taking a look, and I appreciate any help. So, I have a 2011 Macbook Air running Mountain Lion. A while back, I changed the setting up so that when typing, holding down a key would make the letter repeat for as long as I held it down (when I first got my Mac,I had to press it repeatedly). Anyway, I want to get rid of this, and go back to when I could hold down a key and it would give me options of accented characters. Anyone know how to do this?