I'll think about adding something for editing saved characters. But I don't have time to do it at the moment.

As an immediate fix to the problem, you can do it manually by navigating to user\characters and opening the file Character Name.char.comment with notepad.

I implemented some changes to importing characters. While the main reason was maintaining compatibility between older saved characters and the new character generator (which has two more steps), I also ended up making it easy to change or edit the comment on a saved character.