How do I edit a customer?
You can edit a customer's details on the Manage Customers screen within the Invoicing module.
Then click on the customer you want to edit.
Additionally, when you create a new invoice, if you select an existing customer from the drop-down menu, you can update the customer details there and then. Click the 'Update Customer' button, make your updates and click 'Submit'.
To help you better understand the invoicing module as a whole, please visit the module overview page here.