The photo seller plugin creates a few pages when you first install the plugin. These pages are required for this plugin to function correctly. So do not delete these pages.
If you want to hide some or all of these pages from your navigation menu then you should use WordPress’s Menu Feature to do it.
The built-in menu feature allows you to customize exactly which items show up in your navigation menu and in what order. You can access the menu feature by doing to the following:
- Login to the WordPress Dashboard.
- From the ‘Appearance’ menu on the left-hand side of the Dashboard.
- Select the ‘Menus’ option to bring up the Menu Editor.
You can create a custom menu (if you don’t have one already) or edit an existing one from the ‘Menus’ interface.
Read this documentation from WordPress to learn more on how to use this feature.
You should always use this feature to customize the appearance of your site’s navigation menu (don’t delete your pages to manipulate the menu).