docs are here http://wpeden.com/minimax-wordpress-page-layout-builder-plugin/docs/ .
“You say that over 2500 widgets can be used but there are no instructions for how to incorporate them e.g. I want to add a logion section.”
<– means any wp plugin from http://wordpress.org/plugins/ that has a widget , you can use with minimax page layout/content builder. After installing a plugin, you will see all available widget in insert widget popup. From where you can select a widget and insert into layout.