While viewing your Inbox:
Swipe the screen up and down to scroll through your list of messages.
Tap the Compose icon (in the header at the top of the screen) to start a new Gmail message.
Tap the Search icon (in the header at the top of the screen) to search within the Gmail app.
Swipe a Gmail message off the screen to the left or right to quickly and easily archive the message. Tap Undo to restore it to your Inbox.
Tap the letter icon (or contact photo) to the left of one or more messages to select it (indicated by the checkmark icon ). Then you can tap one of the icons in the header at the top of the screen (the Archive icon , the Delete icon , the Read/Unread icon , or the Menu icon ).
While viewing a message, swipe the screen left and right to scroll through all of your messages and use the icons in the header at the top of the screen:
Tap the Gmail icon to return to your Gmail Inbox.
Tap the Archive icon to send the message to your archive folder.
Tap the Delete icon to delete the message.
Tap the Unread icon to return the message to an unread state.
Tap the Menu options icon to access Move to, Change labels, Mark important (or not important), Mute, Print all, Revert auto-sizing, Report spam, Report phishing, Settings, Send feedback, and Help.
If you’re viewing a message or another label, tap the Back Key until you return to your Inbox.