Hello '204wnuczek',
It is not really possible to bid by mistake, as you must enter each digit, click the bid button
then click again to confirm it.
It is, however, possible to change one's mind and regret one's bidding enthusiasm, but
that's not quite the same thing, is it.
To retract your bid, at the bottom of every bid history page is a Learn more link, which gives
you this:
http://pages.ebay.ca/help/buy/bid-retract.html
enabling you to find the Bid Retraction Form you need, whilst reviewing ebay's policy about
retracting.
Notice where it says "Please remember that every bid is binding". In future, use your
Watch List and only bid when you are completely committed to paying for the item.
Otherwise you can always ask the seller to remove your bid for you, and if the seller is
incined to agree, you may then find yourself on the seller's Blocked Bidder list.
Sellers can't stand indecisiveness.
Best of luck.