When you install or update a plugin using the Plugins Manager, the SDK places the plugin .jar file and documents in your user directory. See User Directories.
Choose Tools > Plugins from the main menu to open the Plugins Manager.
Click the Available Plugins tab to display plugins that are available but not installed.
In the left pane, select the plugins you want to add and click Install.
Complete the pages in the installer to download and install the plugin.