If you've set up your Welcome Message properly following the instructions, but it's not being sent to your subscribers, here's several things to consider:
1. Have your subscribers clicked the 'Get Started' button in your Facebook page Messenger? Remember that until they click it, they won't get the Welcome Message.
2. Make sure that people you're looking at have subscribed to your bot exactly by messaging the page directly on Facebook - this is the only way to receive the Welcome Message.
3. If all mentioned above is correct, make sure to check Settings -> Logs in your ManyChat account. It could be that your bot lost connection to a Facebook page, or some other error occurred which prevented the bot from reaching out to your subscribers.
4. Try testing your Welcome Message yourself. If you are not subscribed to your bot yet, all you have to do is open your Fan (Business) Page on Facebook, hover over 'Send Message' button and choose 'Test button' option in the small drop menu, then click 'Get Started' in Messenger - this will trigger the Welcome Message.
If you have already communicated with your bot, you have to delete you conversation on Facebook and message the page again following the steps above.
If nothing helped and the Welcome Message still doesn't fire, be sure to submit a ticket to our Support Team providing maximum details on the matter.
P.S. Don't forget to check if your Welcome Message is enabled ;)