Hey Ben,
I’ve tried adding content on your website, and it is working just as intended. To be clear, this is how it’s done: please go to the “Pages” admin menu section, click on a page you’d like to edit, and add text and other content into the large textarea below the title. After that click on the “Update” button to save the changes; I’ve added some dummy content to the “Writing” page as an example.
Sincerely,
Andrii / Satori Studio