Plugins are distributed as JAR or OBR (OSGi Bundle Repository) files. To install a plugin:

1. 
2. Choose Manage Add-ons.
3. Choose Upload Plugin.
4. Choose Browse to find the plugin file you wish to install from your hard drive and select it, or enter a network location by URL.
5. Choose Upload.
   The plugin will be uploaded to Confluence and will be automatically installed.
6. Check the list of user-installed plugins to ensure that the add-on is available.
7. Enable the plugin if necessary. (Some plugins will be enabled by default when they are installed. Others will have to be manually enabled from the 'Manage Add-ons' page.)