OK so I sorted this out. Basic error really being new to this. I thought it would show up in the Explorer tree on the left but turns out you have to go to Open File then in the top confic bar type /root/ then it gives me access to drill down and get to the apps.yaml file.
Whilst I'm there though and again being new to this. I was told to start using this as it's better to help find errors in the file when I make changes. I took at look at my working file and it shows loads of Red Boxes which I presume it's pointing me out possible errors which can't be correct as the file is working and I haven't messed with those parts.
