Press space or the arrow keys. The reason for clicking the stop button at the beginning is because to change that would take a LOT of rerouting code.
I remixed @-TheForce-'s project "When red button is clicked tutorial!" and changed the code and name. Here is a link to the original project: https://scratch.mit.edu/projects/320493233 #tutorials #when #this #sprite #clicked #block #custom #original #all