updates the Gui of every single player?

** So i have this problem that i try to make a countdown that should show to all players and choosing maps what so ever. but when i try to do this it only changes on a server client not on a local player, i know what's the problem but i just wanna know how access every single player to their player gui to do the best way possible **

----VARIABLES
Storage = game.ServerStorage
Maps = Storage.MAPS:GetChildren()
Teleporters = Storage.TELEPORTS:GetChildren()
---GUI VARIABLES
MainGui = game.StarterGui
Anouncer = MainGui.MainUI.MainFrame.Anouncer.Frame
Time = Anouncer.Time
Chooser = Anouncer.Chooser
Mode = Anouncer.Mode
----WAITING FOR PLAYERS
print("MainScript Loaded")
while wait(1) do
    if game.Players.NumPlayers > 1 then
        Anouncer:TweenPosition(UDim2.new(0,10,0,145),"InOut","Quart",1,false)
        for i = 15,0,-1 do
            Mode.Text = "INTERMISSION"
            Time.Text = i
            wait(1)
        end
        Mode.Text = "Choosing Map:"
        MapChoose = math.random(1, #Maps)
        MapChosen = Maps[MapChoose]
        wait(3)
        Mode.Text = "Map Chosen:"
        Chooser.Text = MapChosen.Name
        wait(5)
        MapClone = MapChosen:Clone()
        MapClone.Parent = workspace
    else
    Mode.Text = "N/A"
    Anouncer:TweenPosition(UDim2.new(0,10,0,145),"InOut","Quart",1,false)
    Mode.Text = "Waiting For Players"
----CHOOSING GAMEMODE
----GAMEMODE CHOSEN
----GETTING PLAYERS
----TELEPORTING PLAYERS
    end
end