How to Archive a Message
You can archive a message by tapping on Edit, selecting the message(s) you want to archive within your inbox, and then tapping on the 'Archive' button at the bottom of the screen.
You'll see an option to confirm your actions.
Tap on 'Archive message' to confirm that you want to archive the message.
You'll see a confirmation banner pop up at the bottom of the screen once the message has been successfully archived.
Unarchiving a Message
If you ever want to reread an archived message, simply tap on the back button within your main inbox to navigate to your Messaging folders.
Select 'Archived' to view your Archived messages.
If you want to unarchive the message, tap on 'Edit', select the message(s) you want to unarchive, and tap 'Move to Inbox' at the bottom of the screen.
You'll see an option to confirm your changes.
Tap on 'Move to Inbox message' to confirm you'd like to move your messages.
You'll see a banner at the bottom of the screen confirming you've moved the message back to your inbox.