In order to add a new email for importing leads from Facebook, you need to:
1. Go to the Facebook Lead Ads page
2. Open “Settings”
3. In the "Email for notifications" column, click the gear next to the page for which you want to add a new email
4. In the window that appears, add a new email and click “Save”
5. If you receive leads on several business pages, then you can specify a separate email for each or specify uniform settings for all pages. To do this, put a tick "Apply settings to all account pages" and click "Save".