[NES] Teenage Mutant Ninja Turtles Day 3

Ok guys. I got stuck here and not too sure what am I supposed to do. Any idea? After I boarded the tank, all I can do is squeeking around trying but there's not much I can do about. I don't know how to get off the vehicle, and due to the fact that I have ran a cheat of unlimited health, I couldn't even kill myself. Please anyone out there, can you help? I still wanted to see what happen next.