You can edit or delete an existing collection from the menu under each board. Click the "+", then the pencil next to the collection you'd like to edit or delete. Reference: http://help.trello.com/article/1004-creating-collections-for-business-class-teams
@Matthew N I´m wondering about the same as Francois. Do you know how to remove the collection after you´ve removed the collection tag from all the boards? On the lefthand side you´ll have a collection listed like: CollectionName (0). How do I delete "CollectionName"?
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