the buttons to the left tell you which colors you can choose from, the buttons at the top tell you which colors you can have your backdrops, the button on the top right clears what you have drawn so far, the 5 buttons that look like circles on the bottom change your pen size, the three buttons on the bottom right change your pen shade, click every object to use its purpose.
i really wanted to make a coloring game then i figured out how to make everything and then eventually i was done