Step 1: Before Starting you need to have...
2) You need to have four sprites. One for the alien body, head, and legs. Another for the arms, and another for the instrument.
Step 2: Observation of Already Made Programs.
If you go into the stage sprite, you will see a programing block starting with the "when flag clicked" command with many blocks after. In this program it has three "if" blocks inside of a huge "forever" block. What that big program chain is saying is, pick a random command, either right, left, or up. For each left, right, or up command there is a program inside of it saying broadcast it and play the voice command.