I want to send some messenger from user in my website to my facebook page. so how to do somthing like that. and create ui for user like, share facebook buttons in my site. thanks!
I don’t think there is any easy frame or something like that, so if you want to access messenger in your app you will have to go through the Facebook API and build the UI yourself.
The Messenger API docs are here: https://developers.facebook.com/docs/messenger-platform
Though it seems that it is meant only for bots and not for you to build it into your app. Which makes sense as Facebook want you to use their app.