When you have found a player who meets your criteria, you can place a bid by selecting the 'Make a bid' button. You will need to deposit a fixed amount of money and a fixed number of GT Stars. At the end of the auction, the player will be transferred into your team if you win the bid. If, over the course of the auction, your bid is surpassed, then a brief notification of this will be sent to your inbox and the amount of your last bid will be returned to your account.