How the blog is set up
The blog is set up using the Blog template file that comes with the parent Beaver Builder Theme. To set this (if you haven't already done so), go to your WordPress Dashboard, then Settings > Reading and set the drop downs as per below:
Posts page: Blog
SETTING UP THE BLOG SIDEBAR
Activating new themes can sometimes cause widgets to be lost due to how WordPress works. For this reason, to set up the blog sidebar you will need to go to your WordPress Dashboard and navigate to Appearance > Widgets and create a new text widget in the Primary Sidebar Widget Area. In this text widget, add the text [fl_builder_insert_layout slug="sidebar-blog"] and click Save. This is shown below.