At the bottom of the screen when you’re reading a message, you’ll find three icons that do the following:
Reply. Tap this and you get three choices: Reply, “Reply all,” and Forward. Reply sends a message to just the sender, while “Reply all” sends the message to everyone who has received it. Forward lets you send the message to someone new. In all cases, the original email message is included at the bottom of the message you send.
Move to. Tap this and you’ll see a list of all folders (or in the case of Gmail, labels) in your account. Tap any to move the email to it.
Delete. Tap this to delete the message.