With Easy Mode
If you are in your account and you have easy mode on go here to enable power mode and change to Paypal: https://www.tradebit.com/indexNew.php/sty_myeasy/mytradebit/myconfigPay
With Power Mode
If you already have power mode enabled, you can go here to update your settings:
https://www.tradebit.com/mytradebit/index.php?myarea=profile