Use the left and right arrows to adjust the angle of the launcher. Use the up and down arrows to change the launch speed. Use the space bar to launch the monkey.
Thanks to Jon Woodcock for the instructions in his book Coding Games in Scratch. https://www.amazon.com/Coding-Games-Scratch-Step-Step/dp/1465439358 Thanks to School of Coding Quanta for her videos walkthroughs. https://www.youtube.com/watch?v=9kdRv6L-mgY