You can set up a Welcome Message to greet your subscribers in the "Automation" > "Welcome Message" tab. With the Welcome Message, you can help your subscribers understand what to expect from your Messenger bot.
Helpful information to include in this Welcome Message includes:
- what is your bot about?
- how often do you post?
- and anything else that you think is important (like your hours of operation, availability, or even your most favorite cat GIF).
Keep in mind, everybody who clicks "Get Started" to start a conversation with your bot will get the Welcome Message!
Hope this helps explain the basics of what a Welcome Message should contain,