To reply to or forward a message
Open the message you want to reply to or forward.
On the message header, tap the Reply icon
, or tap the Options icon 
. Tap Reply all or Forward.Replying to or forwarding messages without changing the subject adds your reply to the current conversation.
Changing the subject starts a new conversation.
The message will open in a new screen where you can add or remove addresses, edit the subject, and add or remove text or attachments.
You can add one or more people to an ongoing conversation by replying to all and then adding the new person’s address(es) to the reply.
Note that the conversation text and previous messages are also included in your reply (or forwarded) message.
Tap the Send icon
in the upper
right corner of the screen to send your message.NOTEYou can change the message action after you've started the message. Simply tap the message action icon
in the message header to the right of
the current message action, then tap the one you want. For example,
if you chose Reply but decide you want to Reply all.