Board Thread:Question and Answer/@comment-86.49.159.20-20150823082558/@comment-26896603-20150823090524

If it's appearing over your cards in the Edit screen then this means your cards are currently in a team.

Go to the 3rd tab in Edit unit and replace the card with another if it's the last one in the unit. That card will be free for you to modify afterward since elemental teams can't be left empty.