You can only start a new shift after your previous shift has been locked. 
Make sure you are in your Dashboard, you can get here by clicking "Dashboard" in the upper right corner.

Once you are here you select the "Start Work" tab at the bottom of your screen.

Select the type of work (Drive, or Other Duty), fill in the time, your location and, if Driving, select your vehicle, then hit "Confirm".
If the "Start Work" button is Red, it means you haven't had a sufficient break in between shifts. I
f it's Green, you are well rested, and good to go!

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