Unfortunately, sections are not available for all pages in the Debut theme. Shopify is supposed to be currently Beta testing a 'Sections Everywhere' feature to allow it on all themes.
Currently, there are themes in the Shopify Theme store with sections available on other pages, such as the Motion theme. (Click on the theme documentation to find the instructions for using sections on pages.)
There are also apps that allow you to add sections to other pages:
It can be done by doing some code customization. please send me a personal message and we can discuss what you'd like