In my sample solution I've added another task to list accounts:
The pipeline is set up with a branch trigger, so when you push changes it will start a pipeline run.
You can copy the YAML from the solution into the original file and then push your changes:
git add --all
git commit -m 'DevOps lab'
git push devops main
That uploads your changes which will trigger a new pipeline run.
It will fail. The az command is installed in your VM, but it's not authenticated so you can't run any commands against your subscription.