Displaying authors on pages is available on the Regular Plan.
Add an App Block or App Embed to the page template in the theme editor.
Open "Pages" from the app menu
Select the page(s) you want to apply an author to (multiple selections allowed)
Click "Apply author"
Choose an author from the dropdown
Click "Apply"
Select the page(s) in "Pages"
Click "Remove author"
You can filter by publication status and title, and sort by published date or updated date.
Only one author can be linked per page.