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A long press [1 second+] brings up the list with a selection box on the left side. This can be done on any of the tabs and usually brings up a different set of choices at the top of the screen.

The long press/delete is to remove the selected key from the key popup list, the trash can in the song edit does the same thing.

To add a key name to the list select 'New' at the top of the screen and enter the appropriate name, ie., Bb or aolian or 'A>D'. To remove a key assigned to a song in error; song edit, then select the 'x' on the desired key name on the 'key' field. That will leave the key in the list of available keys but remove it from that particular song.