Loupe supports extending the server and Desktop client through Loupe Extensions. For these to function they must first be registered and enabled on the Server. Once that's complete they can be configured either on the Server or through Loupe Desktop.
From within the Loupe Server Administrator you can select the Extensions tab. This displays a list of all of the extensions installed on the server. You can selectively enable, disable, and configure them as necessary.
When you enable an extension it may prompt you to provide configuration information. The exact behavior depends on the specific extension.