Subscribing to topics or forums allows users to receive email notifications of new posts.
When a user subscribes to a topic, they will receive a new email of any new replies in the topic.
When a user subscribes to a forum, they will receive a new email of new topics that were created in the forum.
To subscribe to a forum or topic, users should click the link at the top of the post that says Subscribe. After users click the subscribe link, it will show Unsubscribe automatically. Refresh for forums.