Nice
This was a wonderful piece that has a nice feel to it. The message is strong and very meaningful. The song fit well and gave the movie a nice feel. As for your Flash troubles, I am sure you can find a tutorial here on Newgrounds to show you the ins and outs of making a tutorial.
There are a few things that could be improved, but I am sure they are there due to lack of time. First the girls walking animation could use some work and there were quite a few tweens used. I am sure you know how to improve tweens so I will focus upon the walk. First she seemed to change shape when arriving at the post. Also try studying walks it is really useful examining the real world to make your animations seem possible/realistic. A great resource for animators is "The Animator's Survival Kit". It can be found in most book stores and cost $20-$30, but I guarantee you will gain so much from it.
I hope this helps and that this wall of text did not scare you. You are doing great so keep animating!
P.S. Thanks for being so great as to respond to everyone, I find it great that you have time for that!