I found it, the most infuriating forum post ever.
[note: yes I know about denvercoder and fermat]
[SOLVED] How do I edit configuration.yaml when I can't even find the File editor?
I cannot tell you the solution as it is too complex (for me) but the way to find it is to follow the link to Discord provided by @Ludeeus above. You will need to create an account and then post your request in the Home Assistant channel. Clever people might then appear and help you. If you search my username in Discord you might find the conversation I had with them but I would advise against following the same procedure in case there is something different in your setup. Good luck
