Welcome to Subscribing to Forum Threads
When you enable the thread subscription functionality, an email notification will be sent to you when a user replies to a specific thread. This feature is useful if you want to follow the discussion about a specific topic.
Procedure
Open the forum thread to which you want to subscribe.
Discussion Format - click the "Email me" when someone replies link.
When the thread subscription feature is enabled, the link changes to Stop emailing replies to me.
Q & A Thread Format - click "Follow this Question".
When you subscribe to the thread, the link changes to Stop following.
Email alerts will be sent to you when users reply to the thread until you disable the subscription option.