How do I use potions in the Halloween Event?

[Phantom Pimpernel]

So I finally won potions with soul candy. How do I use them? They aren't in inventory and the event page only lets me buy them, I think.

[Hildr]

Click Attack / Heal, then when the new window pops up, your potions should be on the right. Click them there.
A prompt for "use" should pop up.