COMMUNITY

As in title, I can't add my bot to messenger.
I do the following steps:

Add another channel
Facebook Messenger
Use page (I pick a page)
Save a greeting message

Then I go to "messenger extensions"
I click "submit your bot" I pick a page,
and nothing happens?
I couldn't find any tutorial on how to connect the bot to messenger, Could you please guide me through step by step?

Thank you in advance