How to reply a specified message in the Android version?
When you intend to answer your contact’s message maybe in a group among all other members’ conversation, you have to reply in a way s/he understands easily your respond is for which message. For this, tap on the specified message then a new page will be shown.
By choosing Reply among other options listed, you will see your message on top of the message text field and are able to type your reply and send it. The recipient will definitely discover your message is as a reply for which in a simple way.