So you have this powerful page builder that you want to use to build a beautiful website, but unfortunately it doesn't work with the theme you want to use.
How To Integrate Your WordPress Theme
Install Fullwidth Page Templates – In your WordPress website go to Plugins > Add New > Then search for the plugin > Install > Activate
The plugin will add page templates to your pages and posts. When you are creating a new page or post, simply select the page template that you want to use.
Depending on your WordPress theme, you may see more options listed, but these are the 3 that the plugin will add.
That's pretty much all there is to it.