Click the clear button to clear the screen. Click the colours to change the colour of the pen. Click the plus and minus to change the size of your pen. (You may need to click it multiple times.) Click the up arrow key or the paintbrush to put the pen down. Click the space bar to bring the pen up. For different backdrops, click the down arrow key.
Thank you Cherrysprinkles1 for your rainbow printer, it gave me a good idea to do a project about drawing. @Cherrysprinkles1