Once you press the green flag (make sure to do this part!), then all you need to do is press space. When you get to The End, the music will change. PS- if the music suddenly stops, don't worry. The first song is only programmed to repeat 3 times.
The first one is Floss Before Meals *haha*( https://scratch.mit.edu/projects/389943009/ ). Now you meet the stick figure who starred in it! If you want Shadow and Azulo to star in another slideshow, then let me know!