Click the blue circle with pencil on it in the bottom right corner of your screen. Then it should take you to a blank frame from which you can add more. Then once you are done with the animation or picture then youll see a cloud up in the top right corner of the frame. Click it. And then click upload when it pops up. And finally put in a title and description for your animation or picture. Hope this helps!
Oh! Draw or animate something first of course! Then after finishing, at the top right corner is a little cloud! Press that and put in the title and description if you want and voila! I tried to summarize it but hope it helps :>