Defense Grid - The Awakening + Resurgence Packs Key, Moving give-away to forum?

So I've foolishly created a giveaway for a Defense Grid - The Awakening + Resurgence Map Pack steam keys that I received from the Indie Royale April Fools Day bundle without reading the guidelines properly. However, I've been told that I am allowed to give away the keys in the forums by Kyklone. I've created this thread with the intention of giving said keys but I have no idea how this should work.

How should we proceed and how do you close/cancel a giveaway that's still in progress?