How do I charge my renter additional fees for things like security deposits, pets, etc.?

During the process of setting up a new payment, you will be taken to screen where you can choose to include different types of fees. It looks like this:

If you select 'Add Additional Monthly Fees' on the bottom you will be able to choose a fee type and amount. From here, you can choose to add pet fees, utilities, parking fees, or other fees and the amount you want to change for each one.