Google is your friend...embrace it:
Got I wish I could unsubscribe.
Unsubscribing from a Topic or Board
Once you have subscribed to a topic or a board, you may manage your subscriptions in your profile, under Modify Profile > Notifications.
On the Notifications page, you will be presented with a list of every topic and board you have subscribed to. To unsubscribe from topics or boards, check the boxes for the respective topics and boards and then click on Unsubscribe.
To quickly unsubscribe from a topic or a board which you are currently viewing, you may select the Unnotify button which is located above and below the topic display or the message index of a board
Turns out I really am out of puns, not just coffee deprivation :(