You have now successfully completed your first animation; to play it, just press the Enter key on the timeline, or preview by selecting File -> Preview in Browser to see what it will look like when exported. You should see your circle moving smoothly from point A to point B, with no jumps in between.
Practice drawing shapes and using motion tweens on them until you're sure you've got the hang of it; try getting creative with it, and see what you can come up with. Then, when you're ready, it's time to move on to the next lesson in our 2D Animation Tutorials: an Introduction to Shape Tweening.
