How do I make this get all Players in the game and put them in the Scrolling Frame?

I went head and redone the code for you. I don't know if this is just for the player him/her self or if it updates to everyone and is this Server Script or LocalScript?

Here the code.

local PlayersScroll = {}

sf = script.Parent

game.Players.PlayerAdded:connect(function(player)
    if PlayersScroll[player.Name] == nil then
        local su = Instance.new("TextButton")
        su.Parent = sf
        local uid = player.UserId
        su.Name = player.Name
        su.Size = UDim2.new(1, 0, 0.04, 0)
        su.Text = player.Name..":"..uid
        su.Font = "SourceSansLight"
        su.FontSize = "Size28"
        PlayersScroll[player.Name] = su
    end

end)

game.Players.PlayerRemoving:connect(function(player)
    if PlayersScroll[player.Name] ~= nil then
        PlayersScroll[player.Name]:Destroy()
        table.remove(PlayersScroll, player.Name)
    end
end)