I need help on buying something on ebay?

okay so i bought this side kick lx on ebay my debit card has 100 dollers and the sidekick cost 3 dollers and i payed it with paypal or want to am i supposed to scroll down the screen and click continue with paypal? and then it says put the debit card number then the csc my adress and then i click continue to verify and it takes me to this page that gives me the option to put in another card and it shows my card and how do i buy the side kick ?