what do you mean how it work , what do you want to know , join sedo , send your domain for live auction and if they been accepted you will get the email about selection or rejection of your domains , while you send the domain for live auction , they ask you to put reverse price , and if the domain is selected and goes to auction and it have bids , if they meet your reserve the domain is sold , if doesn't then you got your domain , they take 10% of the sale price of the domain i think