Teleport

TeleportScript (TeleportButton)
LocalScript (TeleportFrame)
LocalScript2 (TeleportButton inside of teleportframe)
Teleport (RS)

TeleportScript:
local Teleport = script.Parent.Parent.TeleportButton
local frame = script.Parent.TeleportFrame

Teleport.MouseButton1Click:Connect(function()
    frame.Visible = true
end)

LocalScript:
game.ReplicatedStorage.Teleport.OnClientEvent:Connect(function(plr, name)
    plr.Character.HumanoidRootPart.CFrame = game.Players:FindFirstChild(name).Character.Head
end)

LocalScript2:
script.Parent.MouseButton1Click:Connect(function()
    if game.Players:FindFirstChild(script.Parent.Parent.Username.Text) then
        game.ReplicatedStorage.Teleport:FireServer(script.Parent.Parent.Username.Text)
    end
end)