Using Automatic1111. Which config file do I put "--global --add safe.directory"?

I'm having some issues where I can't label folders as safe, and I can't find the config file that this command needs to be put into:
--global --add safe.directory "<nameofdirectory>"

I remember doing it a while back to get the thing up and running on my external drive, but now I've forgotten where it is. I'm trying to add a tab extension and I'm getting many errors.