1. Open the invoice



2. Mark the invoice as paid



3. Specify the payment method



You can see all past due loads in your notifications



In case you want to make sure that the load is Paid, Refresh the page, and Paid Icon $ will be shown with the icon after the status.  

    If you put your mouse on the icon you will see the date when that load was paid. Additionally, you can use the More Filter to check all your paid loads.