Using your local instance of phpMyAdmin you can add remote databases by modifying the config.inc.php file.
This file should be in the phpMyAdmin folder wherever it is installed on your computer. For me it is located at C:\wamp64\apps\phpmyadmin5.1.1.
WIP stands for Work In Progress
WIP Adding a New Master Account Member
***Note: You do need to generate invoices for sub accounts after they have been created.
Some steps you can try to debug logging into PhotoShelter.