On top you can see size. Just drag it to what you want for your pen. Then u click on the colour u want. After that, u can either press PIC for a picture, or u can draw ur own. If u clicked on PIC drag ur mouse to the spot u want to colour and then click and drag.
I want to thank my coding teacher for giving me a rough example on this project. Sadly, she's doesn't have an account in Scratch. But the rest of it, I did it myself. -@Natashatsaixien