Mutiplayer name tags

hi, I’m trying to add name tags to my multiplayer game, but no matter how I try to do it it won’t work. help?
this is the gamegame
and this is the main menu where the player types their namemain menu
I already have the script outline just need help trying to get them to work so the names can be updated throughout the sever and so me and my friends can know who is who
(code for the user names"username.js" is for the user name input and “usernameDisplay.js” is the thing that updates the user name)