* The initial Idea of it was to create a system were you could type in a message to a specific user if they had done something wrong.
*The pop-up should come up and they would have to press on ok to remove the pop-up.
Why can't you just PM the user? It already comes with the software, and it works essentially as you described. Plus, you have the benefit of being able to confirm if they have read the message or not.
I thought you wanted to set up a message for everyone on the board, not just a specific user...