I am an admin of a Facebook business page and I've enabled "Help people start a conversation with your Page" feature. It shows frequently asked questions to make it easier for people to start a conversation:
Question: is it possible to edit these predefined questions?
Best Answer
Yes. Go to "Settings" of your FB page, then click "Messaging".
Scroll to "Help people start a conversation with your Page" and click change.
The questions are there and you can edit/delete/add.