Personal Conveyance is the setting that allows the Driver to use their truck for personal use, like going to get lunch or driving home - any instance where you need to drive the truck, but not for company business and you don't want it going against your drive time for the day.
In order to enable this for your drivers, the Fleet Manager needs to sign into the DriverConnect Portal, then go to Management > Users. Click on the name of the driver you wish to enable this feature for, and then toggle it on and save changes.