After he stormed the tractor and was taken captive, Finn defected to our side.  

As a trustworthy ally, Phil showed Finn all the controls and gauges so he could operate the machine. 

Finn  learns how the steering wheel works. 

Unfortunately, he doesn’t seem to have figured out which direction he should be looking. 

After his failed attempt at driving the tractor, Finn decided to downgrade to a simpler vehicle. This one doesn’t need to be steered. It just goes forward and back. Very easy. Please don’t run over Pac-Man!