Today we did the robot club. we couldn't figure out how to put the new car together. However we find this link-https://www.fuelcellstore.com/manuals/h-cell-2.0-horizon-fuel-cells-user-manual-fcjj-21.pdf
And then we started working on the old cars. we thought something  wrong with it but there was nothing wrong it was the battery died. So now both car works. The only problem is the remote control have some problem. when we put it off the car moves.