How do you make walls say things on Roblox

There are many ways to do this, but the easiest would be to simply place a decal on the side of the wall that has what you want to say written on it. You could also put the wall in a model with a humanoid object, set the humanoid's health and maxheath to 0, name the wall "Head", and name the model whatever you want the wall to say. This will make text display on the wall that looks similar to the names above Roblox players.