I was trying to search what a Twi'lek is on google by highlighting the word. I wasn't aware the whole thing works like a button and there is no undo vote on the TiTS site.
Taintedspace.com has a poll that is updated occassionally with a request from Fen about what he should focus on next. The current poll is a few different races he might work on.
That said, the poll doesn't offer takebacks, and it's not clear how much it'll affect what Fen does anyway because you generally write what you're inspired to write. Don't fret over it.