How to print the name of the user who pressed a certain button onto a SurfaceGui?

I am 99% sure this will work.

game.Players.PlayerAdded:connect(function(Player)
        local pGUI = Player.PlayerGui
    -- Define the ScreenGui in PlayerGui as "local s = pGUI:WaitForChild('[the ScreenGui's name]') 
    -- Once you define the ScreenGui, define the frame inside it as "local f = s:WaitForChild('[the name of the frame]')
    -- You can get any children of any defined Object by using "[variable]:WaitForChild('whatever')"
    -- Now, define the button.
    local button = f:WaitForChild("[button name]")
    -- You will need a TextLabel. Define it.
    local textLabel = button:WaitForChild("[textlabel name]")

     button.MouseButton1Down:connect(function()
        textLabel.Text = "You are " .. Player.Name .. " and you clicked the button!"
     end)
end)

enterbutton.MouseButton1Down:connect(function()
    p = SurfaceGui.Parent.Parent
    SurfaceGui.TextLabel.Text = p.Name
end)

there you go!