Changing the assignment ensures that trips are attributed to the correct driver. You can change Driver -> Vehicle assignments as often as you like. You must change the assignment before the trips are uploaded to FG PRO but you can do it at anytime before the trips are received.
To change the assignments to the Admin -> Vehicle Assignments menu item
1) Locate the vehicle you'd like to change
2) Edit the vehicle record
3) You'll be provided with a list of drivers in a pull-down menu. Select the driver you want to assign to the vehicle.
4) Click SAVE ASSIGNMENT
5) Remove the driver from his/her original vehicle if you need to using the same process.
NB: You will only be permitted to enter one driver per vehicle. However, any driver can be assigned to multiple vehicles.