Task: Compose a mail in gmail app and send to Rick Weinstein gmail id rick.weinstein@dayrep.com that "Your wife Credit card request is approved now you can collect card at the branch" with subject "Credit card approval done". 
Steps:
Open the Gmail app
Click on the Compose button at the bottom right of the screen
Type rick.weinstein@dayrep.com
Click on the suggested mail id
Click on the Subject text field
Type Credit card approval done
Click on the Compose email text field
Type Your wife Credit card request is approved now you can collect card at the branch
Click on the send icon at the top right of the screen