If you need to apply a different fee amount for individual members instead of team fees, use charges.

Log in using your browser (which can be done in the mobile app, but is faster in the desktop app).

Click “Payments” in the menu, then “Member Balance.”
A list of the Members will appear.
Click the + button at the right of the member’s name to open the “Add Transaction” page.
Choose “Charge” at the “Transaction Type” dropdown list and enter the amount and description, then click [Save].

This is basically the same way payments are recorded, except as individual charges.