HELP! HOW DO I REROLL??

You can't reroll someone else's giveaway, and I don't believe you will get banned.

Remove your entry.

If it's still going, you can simply remove your entry via the giveaway screen. If not, and you have won the giveaway, contact the creator ASAP, and they can get it re-rolled.

Here
Edit: This is assuming you haven't already won the giveaway and just want to remove your entry

I already said in your other thread. Contact the guy who created the giveaway, explain the situation, and ask him to request a reroll.

CAPSLOCK, please.

http://www.steamgifts.com/manage/entries - to the right hand of the page, you can click (Remove Entry) to remove it.

If the giveaway is over, contact the creator and tell him that you can't accept that gift for a number of reasons, and ask for a reroll.

Also, read the FAQ, it'll save you such trouble next time.

What is wrong w/ u? O_O

qwe
press gift sent
and this press "Request New Winner"