In this simulation, you have blocks that you can combine to create a desired motion. You will need one set of blocks with the "setup" and a second set of blocks beginning with "go" for things to work. Once you've finished editing the blocks, click "recompile."
Then you click "setup" and "go" in the simulation (as before), and the car will do whatever you have programmed it to do!
Note: the white vertical lines are spaced every 50m so you know where the car is. Position 0m is at the bottom left of the screen, and the max position is 300m on the bottom right of the screen.