I think you get the idea. Repeat this process and complete the rest of the frames. For frames 18-20 use a solid red square and then use the POP! graphic on frame 21.

Name and save your file. Give it a different name from your drawing file to distinguish between the animation and drawing.

TIP: Name your drawing something like drawing.xar and your animation something like animation.xar. Life is not a contest to see how obscure we can be. Is it?

You can also press the Preview all Frames button to open the player (shown on the left), and play the entire animation, and/or manually move between frames.