(1) Try to create an invoice. Go to Home > Click on the + icon > New Invoice. (2) Then click on the No Customer section of the invoice. (3) Then click on the + icon. (4) Then enter all details of the customer. (First name, Last name, Address, Email, Phone and Terms) (5) Then click on the Save button to create the new customer. (6) Then click on the Ok button to assign that customer to the Invoice. (7) Customer name and address will automatically be populated on the invoice.