Ask your friends or colleagues to give you feedback on the first version of your bot, as well as to share the bot's m.me/ link with their contacts.
You can find the m.me link at the top of the dashboard when the bot is open.
The part after the slash(/) is the username of your page. Custom usernames help people find businesses on both Facebook and Messenger, so they can connect with and message the businesses they’re interested in more easily. If you have not created a custom username, yet, you can do this in the About section of your Facebook page.