To compose and send a message
From the Home screen, tap Google folder
> Gmail 
> the Compose icon 
(in the Gmail Inbox
header at the top of the screen).NOTEIf you set up more than one Google Account on your phone and want to send the message from a different Google Account, tap the current Google Account (at the top left of the Gmail Inbox header), then tap the account you want to use.
Enter a recipient’s address.
As you enter text, matching addresses are offered from your Contacts list. You can tap a suggested address or continue entering text to enter a new one.
Tap the Menu icon
(at the upper-right corner of
the screen), then tap Add Cc/Bcc to copy (normal
or blind copy) recipients, if necessary.Enter a subject for the message in the Subject field.
Enter your email text in the Compose email field below the Subject box.
Tap the Menu icon
(at the upper-right corner of
the screen), then tap Attach file if you want
to add an attachment to your Gmail message.Tap the Send icon
(at the top right of the screen)
to send your message.
If you aren't ready to send the message, tap the Menu icon (at the upper-right corner of the screen), then tap Save
draft.