How do I put a Text GUI above the Player's head?

I've been trying to put a GUI above a player's head that says his/her rank according to a script. This is the part of the script that assigns the ranks:

     rank.Name = "Rank"
     rank.Parent = leaderstats
     if newPlayer.Name == "DevSupremecy" then
        rank.Value = "Chief Developer"
        texta.Text = ("Chief Developer")
     elseif newPlayer.Name == "Dev_Noobity" then
        rank.Value = "Game Owner"
        texta.Text("Game Owner")
     elseif newPlayer.Name == "CordeliaImperius" then
        rank.Value = "Head of Administration"
        texta.Text = "Head of Administration")
     elseif newPlayer.Name = "Bigreddino556" or "XavierVernalls" then
        rank.Value = "Developer"
        texta.Text = ("Developer")
     elseif newPlayer.Name = "Player1"
        rank.Value = ("Studio")
        texta.Text = ("Studio")
     else
        rank.Value = "Guest"
        texta.Text = ("Guest")              
    end

And this is the part of the script that sets up the GUI:

     local gui = Instance.new("BillboardGui")
        gui.Parent=newPlayer.Character.Head
        gui.Adornee=newPlayer.Character.Head
        gui.Size=UDim2.new(2,0,.78,0)
        gui.StudsOffset=Vector3.new(0,2,0)
        local texta=Instance.new("TextBox")
        texta.Size=UDim2.new(1,0,1,0)
        texta.BackgroundTransparency = 1
        texta.BackgroundColor3 = Color3.new(0, 0, 0)
        texta.BorderColor3 = Color3.new(0, 0, 0)
        texta.TextColor3 = Color3.new(1, 1, 1)
        texta.BorderSizePixel = 1
        texta.TextScaled = false
        texta.TextStrokeTransparency = 1
        texta.FontSize = Enum.FontSize.Size18
        texta.Parent=gui
        wait(5)

Is there something wrong with the IF-ELSEIF-ELSE statements?