I figured it was obvious because the previous line says that you "sign your name on the guestlist" or something similar. Sorry if this was not obvious to you. :(
well, usually there would be some text in gray saying "insert your name here" or something and the pink line isn't flashing so it's hard to know that you are supposed to type in there
As far as I'm aware, RenPy does not allow that. Regardless, it's easy to type something on your keyboard and see that what you typed shows up onto the screen. Sorry!
