In the Billing Settings section there are following parameters:
Enable Taxes- check this box if you want taxes to be enabled for users on front-end.
Billing Currency Sign– enter to this field the currency sign to be used for displaying your site services prices.
Send Payment To - enter the name you want to be displayed in invoices in "Send Payment To" section for users
After you selected all needed values for the parameters described above, press the “Save” button to submit the changes, also you can use the "Apply" button to save the changes and stay on the current tab.