You can follow the official Moodle documentation. Below you can find relevant information about the Bitnami configuration.
Using the Web interface
Since Moodle 2.5 you can install any plugin from the Moodle administration panel. With the native installer, this method is available if you select “development” mode during the installation.
Using a manual upload
With this method, you need to copy and uncompress the plugin to the server file system in the correct directory. You can check that the module has been correctly installed in the “Settings -> Site administration -> Notifications” menu (as the Moodle admin user). With the native installer, this method is available if you select “production” mode during the installation.