To see what forums and topics you are subscribed to, click on the "User Control Panel" link near the top of the page. Then, in the user control panel, make sure you are on the "Overview" tab and click on the "Manage Subscriptions" link on the left. You will get a list of all the forums and topics you are subscribed to. You can unsubscribe any or all of them from that list.
To subscribe to a forum, go to the forum index page. At the bottom, look for the "subscribe forum" link. Click to subscribe and be notified of new posts. If it says "unsubscribe" instead, it means you are already subscribed and receiving notifications. Click it to unsubscribe and end notifications.
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You can also subscribe to just a specific topic using a similar link at the bottom of the page when viewing the topic.
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