Plugins are distributed as a jar file. To install a plugin:

1. In the 'Administration' section of Confluence, click the 'Plugins' link.
2. Use the 'Browse' button to find the plugin jar you wish to install from your hard drive or network location, and select it.
3. Click 'Upload'.
4. The plugin will be uploaded to Confluence and will be automatically installed.
5. Check the 'Plugin Administration' screen to ensure if the plugin is available.
6. 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 Plugin Administration screen.)