Tap on the highlighted "E-mail" App icon to open the App.
Tap on the "+" icon to open a fresh e-mail for drafting.
Type the e-mail ID of the person you want to send the e-mail to.
Now tap on the "Subject" field and type out the subject of your e-mail.
Now, tap on the blank e-mail body, as highlighted, and type out the content that you wish to send.
Tap on the highlighted "Send" icon to send the e-mail.
In order to check if the e-mail has left your mailbox, tap on the "Menu" icon on the top-left.
In the list of folders, tap on "Sent" to go to your sent items folder.
The e-mail you just sent should appear on the top of the list.