How to communicate / send messages between listing owner and logged in member?

I installed GD version 2 and buddy press and activated membership also
Now there is no option for users to communicate or send a message to listing owner. In GD version 1 there was an option “Send Message” looks in GD version 2 its removed which is very basic requirement.
I am sorry If this option already available and please let us know how to enable in listing detailed page

Also very importantly we need to implement buddy press profile and bp messages options in listing detailed page (logged in user can send private message to listing owner). I know this option might not available in default please can you send me the developer tutorials for GD. we are developers so let we implement it.