Instant replies are messages that are sent automatically as your Page's first response to new messages. For example, you can use your instant reply message to let customers know how to order from your store if you can't reply yourself.

To set up Instant reply, please open your Facebook Business Suite > navigate to Inbox > select Automations
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Click on Create Automation
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Then select Frequently Asked Questions and click Edit automation
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Click on Add another question and proceed
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Now you need add your first question and answer for the question.
For example:

ProTip: click on this button to personalize your message. Include customer name or your website.
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Add all your question options and hit Save changes