If you have allowed users to subscribe themselves to (join) a group, you can use this wiki plugin to allow them to subscribe/unsubscribe to a specific group. Please see PluginSubscribeGroups for a similar plugin for subscribing/unsubscribing to more than one group.
Plugin Manager error: subscribegroup plugin not found
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{subscribegroup group="Editors" subscribe="Subscribe to %s" unsubscribe="Leave %s" subscribe_action="Name of subscribe submit button" unsubscribe_action="Name of unsubscribe submit button"}
It is possible to make a link to toggle from subscribed/unsubscribed status to some group called GroupName by creating a link to a page which contains this plugin and adding the following parameters: