Click on the Sequence to export and choose >File>Export>Media or click "Command M"
Choose the following:
It will be a Custom Preset used
|Basic Video Settings choose (You Have to Uncheck the check box next to the Width and the Hight to change the aspect ratio)|
1280 x 720 and lower is the only video quality supported in our suites
Frame Rate - 23.976
Field Order – Progressive
Aspect – Square Pixels
Choose to "Export"