Getting Confused on how to locate EVERYONE in a server script. help?

So I've Made a local script which every time a player joins it checks to see if the player is in the list/table if that person is then the GUI/TextButton Shows up. heres the script

local players = game:GetService("Players")

function addPlayer(player)
    local isVip = {["WillBe_Stoped"] = true, [""] = true, [""] = true,[""]= true,[""]= true,[""]= true}
    if isVip[game.Players.LocalPlayer.Name] then
    script.Parent.Visible = true
    end
end


for _,player in pairs(players:GetPlayers())do
    addPlayer(player)
end


players.PlayerAdded:connect(addPlayer) -- local script (This one works)
-- I added this script to show what im doing

Now for my other scripts. This one is inside the TextButton so when you click it, it should fire an event.

script.Parent.MouseButton1Click:Connect(function()
    game.ReplicatedStorage.DisableBalls:FireServer()
end) -- also a local script

now for my final script

game.ReplicatedStorage.DisableBalls.OnServerEvent:Connect(function()
    -- inside here i have no idea what to put.(Im tryning to make it so that when the Admin/VIP person Clicks the TextButton It Should Disable another GUI for everyone else)
end)

i may suck at explaining but you can ask me questions in comments xd