In My eBay, hover over the Account tab and go to Manage my Shop.
Under Marketing Tools on the left side, click the Listing frame link.
Select your preferences: Decide whether you'd like to show your Shop header and left-hand navigation category list, or just the header. Customise your Shop listing header. Add a message for buyers - you can even set it to be personalised with their user ID. Add links to your Shop pages.
To see how it will look, click the Preview your listing frame link.
When you're ready, click Apply to update your listings with the new frame.