To create a New Customer, you can choose to Create Customer from Quick Actions buttons in header or you can click 'Customers' section in the left menu and it should take to a page with a list of your customers. On this screen, you will find a button 'New Customer'. You can click that and a dialog will appear asking you to enter customer information. You can fill the required and optional fields and click submit. If all goes well, you will receive a success message and customer will be added to system.