I know it's not terribly intuitive. Create an account, then go to the 'buybuybuy' tab on the menu bar. Select 'fiction' from the drop down, and then go down towards the bottom of the page (passing elyn along the way...). Eventually, you get to me. Type what you want to bid in the purple box (if you change the drop down on the right hand side to 'United States', it will show you amounts in dollars.) Once you have typed in your amount, press 'bid', and you are good to go.