Credit back time
If you'd like to credit back time for a client (if, for instance there was broken equipment and you don't want the booking to count against their plan hours), just go to the calendar their booking was on, edit the booking and change the "booked by" value to be "n/a" rather than the client name. Then, the system will not count the hours of that booking towards their plan. Please do that before the end of the month.
Credit back a dollar amount
If you'd like to credit a dollar amount back to a client, go to Clients > Client name > Fees/Credits > Add.
This can be a one-time credit (to be applied to the client's account immediately) or a recurring credit (to be applied again every month).
Applying a credit to a client puts that dollar amount back on their TFC account. Any future charges the client incurs (hourly bookings, storage, fees, monthly plan, etc.) will first pull from this credit before charging the client's payment method.