Ok, yeah I see, always good to start slowly. Giving the player the option to input text is a bit more complex than you would think as GameMaker doesn't have any options for that other than just checking on single keystrokes. I never work with drag and drop, I will have a quick look at what's possible.
EDIT: hm, I don't really see an easy solution for that with drag and drop, maybe I'm just not seeing it but it seems easier with code. You might want to just give the player some options to choose between if that's possible.