How do I make a way of selecting servers like in Conquerors 3 and Apocalypse Rising?

So for my game I'm making an easier way of joining servers with friends and VIP servers using the system that apocalypse rising uses but I don't know how that works if someone could explain me how it works I'd be thankful.. Sorry I have no script or anything of me trying..

Edit

heres the general idea

local TeleportService = game:GetService("TeleportService")
local level1Id = 388772448
local level2Id = 427143548
local textBox = script.Parent.Parent.TextBox
local player = game.Players.LocalPlayer 

script.Parent.MouseButton1Down:connect(function()
	if textBox.Text == "" then
        TeleportService:Teleport(level1Id, player)
	else
	-- teleport player to friends server
	end
end)