You can look through the auction without registering, but in order to bid on an item you must register as a bidder.
Registration is free and easy.
If you have any questions about the item you are bidding on, you can e-mail the seller by clicking on the sellers name in the box on each item page. It is recommended that you contact the seller if there are any possible questions about the auction item. If the seller does not provide a picture of the item in the description, you would be wise to contact the seller to see if an image file can be emailed to you. Getting a complete description ahead of time will prevent unpleasant surprises later when the item arrives. If you are outbid on an item, you will receive an e-mail message automatically warning that someone has made a higher bid on the item.