Changing a customer's details is as easy as opening their record and making your changes. Note that changes won't be reflected in a customer's existing invoices or quotes. For example if you change a customer's address, their old address will still show in their existing invoices, but their updated address will show in any new invoice you create.
If you need to update an existing invoice, see Editing invoices.
To edit a customer
Go to the Contacts menu and choose All contacts.
For the Contact type, choose Customer.
Click the customer name to open their record. Need help finding a customer?
Make your changes.
For more details about the information you can store for a contact, see Viewing and entering contact information.