To install the free Groups plugin follow these steps:
Installation from your WordPress Dashboard (recommended)
1. Select the ADD NEW option from the PLUGINS menu in WordPress.
2. Insert “groups” in the search bar.
3. Activate Groups from your WordPress Plugins menu (Access your Installed Plugins menu to check it’s listed)
Installation using the plugin .zip file
1. From WordPress Plugin Directory, access https://wordpress.org/plugins/groups/ and press the DOWNLOAD button.
2. Check that the groups-a.b.c.zip file was correctly downloaded (zip format). If you’re using Safari and cannot get your zip file, access the General settings of the Preferences menu and untick the checkbox “Open safe files after downloading…”
3. Select the ADD NEW option from the PLUGINS menu in WordPress and press the UPLOAD PLUGIN button.
4. Select the downloaded file.
5. Press the INSTALL NOW button and accept the confirmation message.
6. Activate Groups from your WordPress Plugins menu (Access your Installed Plugins menu to check it’s listed).
Updates
You can use the usual automatic update process.