Find the Shortcuts section in the left menu bar. Click on the name of your Page. If you don’t see this option, you can click on “Pages” under the “Explore” section and select your page from there.
Make sure you’re looking at the menu to the right of the main menu.
Remember to make these messages non-promotional, or you will not be given access to subscription messaging. Check the box at the bottom of the form to prove that you understand.
Facebook says these requests can take up to five business days to process. You will receive a notification detailing Facebook’s determination.