In the Navigation Bar, tap the Inbox icon.
To view a message, tap the message you want to open.
Tap the Reply link.
Type your message reply [1]. If you want to add an attachment to your message, tap the Attachment icon [2]. To add additional recipients to the message, tap the Add icon [3].
When you are ready to send your message, tap the Send icon [4].
View your message reply in the message thread.