Thank you Matthew.
I get stopped at step 3 of the process on that help page. (3. Next to Linked Airbnb calendars, click Link)
There is no link button there. The availability section tells me there are no linked calendars for this listing. Next to "Linked Airbnb calendars" there is an 'edit' button. Clicking that only leads to a page saying "Link your Airbnb calendars" ..."Link your related Airbnb calendars to avoid double bookings" and then a link to the help page that you shared with me.
What do I do? I cannot complete the listing for the room within the house - and I cannot link any calendars