FiliteringEnabled and RemoteEvents, how do I access PlayerGui from ServerScriptService?

So, I am trying to make a button that changes a team and also changes a Value, which is in PlayerGui. Using remoteevetns, I am trying to figure out how to change something in the PlayerGui from the script in ServerScriptService. Is there anybody who could tell me how to do this?

Here's something I wrote up similar to what I am trying to do:

Script in ServerScriptService (Script):

local ReplicatedStorage = game:GetService("ReplicatedStorage")

local TestEvent = Instance.new("RemoteEvent")
TestEvent.Parent = ReplicatedStorage
TestEvent.Name = "TestEvent"

local function TestEventRequest(player,TestValue)
player.TeamColor = BrickColor.new("Bright red")
TestValue = "Red"
end
TestEvent.OnServerEvent:Connect(TestEventRequest) 

Script in TextButton (LocalScript):

function click()
local TestValue = script.Parent.Parent.Parent.TestValue.Value
local ReplicatedStorage = game:GetService("ReplicatedStorage")
local Test = ReplicatedStorage:WaitForChild("TestEvent")
wait (0.02)
Test:FireServer(TestValue)
end
script.Parent.MouseButton1Down:connect(click)