For editing these boxes, go to the Appearance > Widgets menu and insert as many Text widgets as you like into "About Section boxes on homepage" widget area.
To insert the "Read more" button anywhere you like, you can use this useful custom shortcode:[more-button link="URL address"]READ MORE[/more-button]
If you do not want to display this area, go to the "Theme Options" panel. In "Homepage Settings", you can hide this area. Same way you can rename or hide the other areas, too.