Changing player gui through local script?

This is my attempt at changing a gui through a local script

wait(1)
local plr = game.Players.LocalPlayer --Get the player
local gui = plr.PlayerGui.ScreenGui.Info --Get the gui
 
gui.Text = "Intermission 9" --Change the text
wait(1)
gui.Text = "Intermission 8" --Change the text
wait(1)
gui.Text = "Intermission 7" --Change the text

the problem is that it doesnt change the text and it shows no errors in the output

Where is the script located? A local script only runs in specific places.