Arduino Mega2560 Manual page 39

(6)You can click the "< " ">" " ^" " v " direction keys to make the car move. Use
"||" pause key to stop the car movement.
Click Obstacle to shift left side, Click Tracking to shift right side.
Click F1 to make upper-left diagonal movement, Click F3 to make upper-right diagonal
movement
Click F4 to make back-left diagonal movement, Click F6 to make back-right diagonal
movement