Your bidding power is a sum of total bid deposits made times the BPM (bidding power multiplier) and may be used to place bids at an auction.
e.g. Your bid deposit is $100. The current BPM is 10x. 100 x 10 = 1000. You can place bids of up to $1000 throughout the auction.
Refunds are automatically processed once the auction officially ends. It may however take up to 10 business days for the refund to appear on your account.
Make sure to check your spam/junk folder. If you still don't see it, wait about a minute or so before trying again.
Some auctions may allow pre-bidding for certain items. Be sure to review the lot info to see if pre-bidding is available for selected items.