@matthewhurst Ahh, yes. The Micro.blog dashboard design page was updated pretty extensively last week. I’ll need to update those instructions for CSS and Custom Footer.
You’ll need to go to the Design page first. You should see a Custom theme option. Make sure something is selected there, even if you have to create a new one. It can be named anything. This is how you put your own layer on top of Tiny Theme (or any theme).
Once a Custom Theme is selected and saved, you’ll see a button that says Open Theme. Click that. The top two files are the ones to modify. You can technically modify any file, but that’s getting into the weeds and can cause problems with updates if you don’t know what you’re doing.
More coming in next reply.