Congratulations! Now that you have been notified as the winner, the contest holder will also let you know if there are any minor changes to be made in the wrapup. Once you have all the final files ready to go, the contest holder will download them and approve them by clicking the box "Happy with these files".
You will then provide some feedback to the contest holder and upon completion, the money will be transferred to your HiretheWorld account.
Just go to "Account Balance - Transactions" to see your balance and request a withdrawal of that balance to one of your withdrawal methods. Your job is done and you just have to wait for payment to be processed.