This article only applies to the old designer. Not sure which designer you have? Check here.
Go to Design
From the merchant portal, choose Design from the navigation menu.
Go to the Code
Find the section for Published Design and press the Code button.
Add a New Customer Only Page
Find the section for Customers and click the +Add New text. A window will pop up and ask you to name the new page. Whatever you choose as the name, make sure it ends in .html. Our test customer only page is named CustomerOnly.html
Note: Ensure you place the HTML file under the customer directory or it will be visible to everyone.