The Media Library does not have a default navigation link, so you’ll need to add one if you want users to access it directly.
You can add the Media Library to a homepage using a Quick Links applet or a Custom Content applet, either by selecting it from the internal link picker or linking to its web address.
You can also access the Media Library directly by adding /Media/Home to the end of your Oak site URL.
You can also add it to the primary navigation menu. Open the menu, select Edit, add a new section, choose Make this a link, then select the Media Library from the Applications section of the picker.