compassionatehuman:

Now you’ve got a cord full of magic. If the spell was one of binding, or protection, or some other spell where you want the magic to stick around, keep the cord somewhere safe, or on your person. If you want to release the magic, such as for a wish spell, or a blessing, or luck spell, untie the knots in reverse orderwhile focusing on the goal to release the magic. To end the spell without releasing the power, cut the knots, or tie the ends together and bury the cord.