Hop offers several ways to reply. The simplest way is to tap on the bottom part of the conversation thread, where it says “Reply…”(if previous message has a subject) or “Message…”(all other cases) It is also possible to reply to a specific message within the thread. This is very convenient when you have several messages and you wish to reply to a specific message –for example- with a different subject or issue.
For iOS: Swipe (right to left) over the message area. The message menu bar will pop up on top of the relevant message. Tap on the left arrow to reply.
For Android: Long press over the message area.
You can always reply with the traditional email view using the advanced send feature (near the send button).