Hi,
it’s very simple, you need to create a file called add_new_gd_schema.php for example and paste this code in it:
https://gist.githubusercontent.com/Stiofan/6547561ed35da6a82e56/raw/ccaa5162aadc2bb085c677a655d2a1ff62ede25b/add_new_gd_schema.php
After that you need to edit this 2 lines to add the correct schemas:
$schemas['NewSchema'] = 'NewSchema';
$schemas['AnotherNewSchema'] = 'AnotherNewSchema';
If for example you want to add the following 2 schemas:
EducationalOrganization
CollegeOrUniversity
You’ll need to modify the 2 lines as such:
$schemas['EducationalOrganization'] = 'EducationalOrganization';
$schemas['CollegeOrUniversity'] = 'CollegeOrUniversity';
If you need to add more schemas, just add more of the above lines accordingly.
Once your file is complete upload it as any other plugin and activate it.
Hope it’s clearer now.
Thanks