[UNANSWERED] How can I add must be in this group and a certain rank to this?

I can't figure it out, since it is a Gui button. People have told me to just add some code, but it won't work. I am asking for you to add it for me, because I probably made some error.

function onClicked() 
script.Parent.Parent.CurrentLevel.Text = "Current Lockdown Level: 0"
wait(0.5)
game.Workspace.LockdownSystemScreen.LockdownScreen.SurfaceGui.CurrentLevel.Text = "Current Lockdown Level: 0"
end 
script.Parent.MouseButton1Down:connect(onClicked)