Click into Account Settings from the drop down arrow by your name (top right corner) -> Click into the Fees Tab. Click the "+" sign to start creating your fees and taxes to pass along to your clients.
Adding Fees and Taxes
Click the "+" sign to create your fees and taxes you wish to transfer to your clients...once you have created your fees/taxes you can then attach them to your memberships and packages. (You will be asked if you wish to add a fee when you create a package or membership in Client Billing).