You can get some instructions from the PageBuilder 'About' menu.
As to your specific question: You indeed need to 'Add a Page' from the plugin menu. Then, for an 'About Us' page, you should create a 'simple' page (a 'category' page would build a page for every category...). Once you save the page definition, a template will be created in the 'pagebuilder' template directory. You should edit this template to suit your needs.
I hope this helps.
Ivan
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Iyengar Yoga Resources / GT Plugins
As to your specific question: You indeed need to 'Add a Page' from the plugin menu. Then, for an 'About Us' page, you should create a 'simple' page (a 'category' page would build a page for every category...). Once you save the page definition, a template will be created in the 'pagebuilder' template directory. You should edit this template to suit your needs.
I hope this helps.
Ivan
-----
Iyengar Yoga Resources / GT Plugins