Self sign addon for personal use

Hi!

I want to sign addon myself for my own use. I dont want to distribute it or have it code reviewed by Mozilla people. How do I do that?

I found this tutorial. https://addons-server.readthedocs.io/en/latest/topics/api/signing.html

It talks something about guid but link to explanation is broken https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/Install_Manifests#id

How do get that guid? And how do I get that ?