This screen lists and lets you manage all installed skins in your site. It can be accessed via the collection settings and also through the System menu.
At the right-most side of the list, you can find the Action column as follows:
- Edit skin properties: this action will direct you to: Skin Properties.
- Uninstall this skin: this option allows you to uninstall a previously installed skin. You can only uninstall a skin if it is not used by any collection - see Collections column in the screenshots above.