When you are assigned to an order as a Contractor, you will see the order you've been assigned to in the Pending Orders area on the main dashboard.

Accept or Decline the order accordingly. To reject the order, click the arrow next to "Accept" to reveal a "Decline" option.

When an order has been Accepted, you will see that order on your main appraisal dashboard. You will also be able to see the appraisal details page for that order by clicking on it from your list of appraisals:

You can now easily start working on your assigned orders in Anow as a Contractor!