To modify the theme, you have to open the customize page. If you don't know how to do that, please refer to here.
At the customize page, you will see available sections in the "Sections" tab.
You can edit an available section by clicking it. Or you can also add a new section by clicking "Add section" button.
Then choose a section you want to add then click "Add" button next to section's name.
Note: all sections in our themes have the common settings such as "Background Color", "Section Gutters"
1. Background Color:
Help you set background for a section.
2. Section Gutters:
"Section gutters" will help you control the distance between the sections.
