Subscribing 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, as shown here:
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To remove your subscriptions, go to your User Control Panel and follow the links to your subscriptions.