Making a textlabel change for everyone is the game?

So am making a minigame and I want the text to change for everyone but its not working?

This is the local script:

local client = game:GetService("Players").LocalPlayer
local RepStore = game:GetService("ReplicatedStorage")
local remote = RepStore.Remote -- LOCATING THE REMOTE

while true do

remote.OnClientEvent:Connect(function()
    local pgui = client.PlayerGui
    pgui:WaitForChild("MainText").TextLabel.Text = "Test" --Changing the textlabel

remote.OnClientEvent:Connect(function()
    local pgui = client.PlayerGui
    pgui:WaitForChild("MainText").TextLabel.Text = "TestAgain" --Changing the textlabel
end)
end)
wait(4)
end

this is the script:

local RepStore = game:GetService("ReplicatedStorage")
local remote = RepStore.Remote

wait(2)
remote:FireAllClients() --Firing to the clients