What's wrong with changing it in the MySQL-admin program (from which you showed your screenshot)? There is an Edit button there.
If you want YOUR USER/GAMER to be able to change the message then you were not very clear (you asked for "
I want to change the message"). So please be very clear and please describe your questions with more detail.
If you want your program/game to be able to change the message (and database) you can look
here (or
here for the Dutch version). You'll need to present the user with a line to change the message. I assume you can do that yourself (as you've already written a console-game) so if you get stuck with these examples please show us your attempt at the code. (We can't keep writing all the code ourselves).