If you wish to add new reply in the middle of your Convo you can do it easily by clicking on the reply button like this:

You may need to hit enter to create a new line if you're trying to add a reply right by an existing group of replies.
If you wish to add new reply in the middle of your Convo you can do it easily by clicking on the reply button like this:
You may need to hit enter to create a new line if you're trying to add a reply right by an existing group of replies.