Maybe I'm missing something but i don't see any options to edit or delete a collection after you have made one so I think this would be a nice addition. I ended up making a duplicate collection by mistake so I'd love to be able to delete it from my list.
Now that you mention it, there used to be a red X on the top right to delete collections that way. That's how I got rid of some of mine, but it's gone. Odd.