PASSWORD - How can I modify password page content
When your store is protected by a password, our themes will show some content, as well as (depending on the theme) a background image.
You can easily change those elements in the theme editor. To do that, make sure first that our theme is the published theme. Then, click on this link. You will be redirected to the theme editor, right into the password page. On the left sidebar you will have access to a dedicated "Password" section. Click on it and you will be able to upload your own background image.