How to delete a word from the auto word complete?

[The Weez]

Whenever I try to type "up" it comes up with several suggestions, and the one it defaults to is "ip". So oftentimes I end up selecting "ip" and then have to go back and correct (IF i notice the mistake).

How do I delete a word from the library? Or, how do I change which suggested word it defaults to?

I thought it would start using "up" if I just slowed down and never selected "ip", but it still uses "ip" every time!