Within the program hit F1 to select from a number of HELP screens 3.
APRS commands are single KEY commands.
For the Vehicle tracking it is important to use the standard 145.79, 445.925, HF 10.1515 LSB and CB channel 29 vehicle tracking frequencies, if available. Mobile's are often XTAL controlled. Each night when you secure, tune your APRS radio to a different digital frequency and see who you pick up. There are two important DEMO commands for past events. Many past APRS events are included on the distro disk.