If I'm thinking of what you're thinking of - then you cannot change it. I think it's to do with licensing with Clickteam or something? Although if you buy MMF Pro, you are then able to change it and sell your games - not sure if you can do it with TGF pro, maybe?
Basically if you have ordinary TGF standard, you can't change it.
It's probably against the licencing or whatever but if you were to google along the lines of 'version information editor' or similar you might find an app that'll mess with that stuff.
Thanks, I've got TGF Pro, I've read the readme and thar RTF file that comes with it and i haven't find anything that could forbidden me changing that description. And I'm going to google that stuff.