Bookmarking in the Forum is much like bookmarking in your web browser. You aren’t alerted when there’s an update, but you can come back to the topic later. Subscribing, however, will notify you when there is an update to the topic or forum on the board via your preferred method or methods.
To subscribe to a specific forum, click the “Subscribe forum” link upon entering the forum. To subscribe to a topic, reply to the topic with the subscribe checkbox checked or click the “Subscribe topic” link within the topic itself.
To remove your subscriptions, go to your Profile and follow the links to your subscriptions.