Player GUI Changing Text?

how do i change the text in a gui for all of the players

local guiname  -- name of the gui there
local textlabel -- name of the textlabel there

for _, player in pairs (game.Players:GetPlayers()) do
	if player:findFirstChild("PlayerGui") then
		if player.PlayerGui:findFirstChild(guiname) then
			if player.PlayerGui[guiname]:findFirstChild(textlabel) then
				local text = player.PlayerGui:WaitForChild(guiname):WaitForChild(textlabel)
				text.Text = "Something" -- the text
			end
		end
	end
end