Trouble creating basic codes on my own and not copying what is used

I am having trouble playing in the playground. I can only do simple tasks like drawboxes. I was trying to use pickrandom inside the drawboxes, but I cannot succeed in getting my code to work. Do I need to send a variable for color and then do drawbox(pickrandom(color)) ? Can someone show me the I can type up? I started using the code playground to try to make coding more intuitive for me because for three of the lessons in animation I was totally stuck and had to copy the code from your page. Now i am trying to do everything from the basics (like drawbox) but also make it entertaining for me (using variations like pickrandom for right now). Thanks

Can you show a screenshot of something you feel should work but doesn’t?