You can mark the Appraisal as 'Approved' if you have been set up as a manager in the Vehicle Appraisal Manager Approval role.
The tick is located in the MORE menu as 'Approve Appraisal'.
Alternatively you can tick 'Manager Approval' check box within the Valuation section.
If the vehicle is successfully purchased by the dealership you can also mark your Appraisals as 'Traded' from the same location.