Verb
To loose from pins; to remove the pins from; to unfasten; as, to unpin a frock; to unpin a frame.
Source: Webster's dictionaryLuckily that’s incredibly easy, because you can unpin the Store from the Taskbar by simply right-clicking it and selecting “Unpin from taskbar”. Source: Internet
Current flow: Open note → Click Info → Click Pin to Top; same for unpin. Source: Internet
Select it, mash the throttle, and laugh until your passengers manage to unpin themselves from the seats and smack you in the back of the head. Source: Internet