Sorry, I don't know if my subject made sense.
I recently registered a domain with my hosting company, and they have the Coppermine gallery pre-installed. I go into PHPMyAdmin, and I have NO idea how to change or add the templates. I'm new to the whole PHP & SQL world. You "FAQ" on how to create/edit themes don't explain how I can do it using PHPMyAdmin. Please could you help?
It doesn't explain it because it is not possible. Themes have nothing to do with SQL. The themes are located in the themes folder in your Coppermine directory. Add new themes by uploading them there, modify the themes by changing the files.
You should never use phpMyAdmin to make Coppermine table changes. Use the interface from within Coppermine.