If it is your first time viewing then click the green flag to start. If it is your second time then click the space bar once and the up arrow once if you did not watch all the way through to make the sprites return to their positions.
I started with the starter project given to me by CS First. I then watched the videos and added broadcast blocks to tell my sprites when to go. I also added switch costume to blocks to make the sprites look as if they're walking around. I used the add-ons: Alternate Ending Reveal the Frames