To submit a mileage expense, click the '+' icon, click the 'Request reimbursement' link, and click the Mileage icon.

You can calculate the mileage automatically or enter it manually. To calculate mileage based on entered destinations, simply click the 'Find Route on Map' link

Enter From and To destinations, select the relevant route, and click 'Add route'. 

Enter the date and click Next to continue with the submissions of this request.   

The map attached to this request serves as a proof of the distance calculated.