OverHeadGui Group rank checker and rank name?

Ok so I made an Overhead gui script and I want it to check if a person is in a group and if he is not kick him and if he is check his rank and make it the text.

game.Players.PlayerAdded:connect(onPlayerRespawned)
function onPlayerRespawned(newPlayer)
	wait(1)
	if newPlayer.Name == "YourNameHere" then 
		gui=Instance.new("BillboardGui")
		gui.Parent=newPlayer.Character.Head
		gui.Adornee=newPlayer.Character.Head
		gui.MaxDistance = 100
		gui.Size=UDim2.new(3,0,3,0)
		gui.StudsOffset=Vector3.new(0.5,2,0)
		text=Instance.new("TextLabel")
		text.Text = ("GAME CREATOR")
		text.Font = "SciFi"
		text.TextColor3 = Color3.new(234, 252, 0)
		text.Size=UDim2.new(1,0,1,0)
		text.FontSize = 'Size32'
		text.Position=UDim2.new(-0.125,0,-0.25,0)
		text.BackgroundTransparency = 1
		text.Parent=gui
	end
end

function onPlayerEntered(newPlayer)
	newPlayer.Changed:connect(function (property)
		if (property == "Character") then
			onPlayerRespawned(newPlayer)
		end
	end)
end

game.Players.PlayerAdded:connect(onPlayerEntered)

That's the script I would appriciate if u help, thanks for reading.

local GroupID=1234567 --Put Group ID here
game:GetService'Players'.PlayerAdded:Connect(function(Player)
	local Check
	local AlreadyChecked
	local Rank
	Player.CharacterAdded:Connect(function(Character)
		if not AlreadyChecked then
			if Player:IsInGroup(GroupID) then
				Rank=Player:GetRoleInGroup(GroupID)
				AlreadyChecked=true
				Check=true
			else
				AlreadyChecked=true
			end
		end
		if Check then
			local Head=Character:WaitForChild'Head'
			local Gui=Instance.new'BillboardGui'
			Gui.Parent=Head
			Gui.Adornee=Head
			Gui.MaxDistance=100
			Gui.Size=UDim2.new(3,0,3,0)
			Gui.StudsOffset=Vector3.new(.5,2,0)
			local Text=Instance.new'TextLabel'
			Text.Text=Rank
			Text.Font='SciFi'
			Text.TextColor3=Color3.fromRGB(234,252,0)
			Text.Size=UDim2.new(1,0,1,0)
			Text.FontSize='Size32'
			Text.Position=UDim2.new(-.125,0,-.25,0)
			Text.BackgroundTransparency=1
			Text.Parent=Gui
		end
	end)
end)

Fixed it for you, just change the group id to your group and it should work, let me know if you have any questions :)