Messages In a lobby[HELP]

I recently joined a game and the guy had colored text at the top of his screen, like it is when the game is when it shows you what team you are on when you first join a game, I was wondering how he did this and if There is a tool taht allows me to do this

if you mean in the game when you choose your class yes what war3zdude92 said

if you mean in the lobby where you can modify your class then i dont know