not able to add content using page builder
You tried to reach the theme author?
If you are still under the Support time policy (6 months) you can contact author and request help from him!
How to reach author
Swapna R Sharma
I don’t know if I can post the link here, but you can contact the author from its profile page.
Here it is: https://themeforest.net/user/themegoods