Participating in an online auction is as easy as creating a free account on the auction platform and browsing the site for items you're interested in. Once you find something you want to bid on, you'll most likely need to provide payment information upfront and then you can select your item and enter the amount you'd like to bid. It's important to keep watching items you really want in case someone else outbids you and you want to bid again. If you want to sell an item, you will list it by providing a description of the product, a starting bid amount, setting a bid increment, and other relevant information.