Suppose your friend has sent a message on Facebook. Now you want to reply him/her on mentioning that message.
Go to Your Facebook “App”
Click on “Merganser”
Now, Tab on a “Message” from the message list.
Now, Keep “Pressing/Tapping” on Text on which you want to reply.
Then, Click on “Reply Icon” “”
Now, Type message and Send it.
Done. See the result with specific message’s text reply to Facebook Friend.