Full Instructions here: http://www.mpgh.net/forum/2-general/782703-create-yo-avatar-my-game.html#post9194234

Rename your image "player.png" to load and test it in the same folder as the .SWF.
Use the 3 existing characters as examples for learning and testing.

Character 1 has four animation frames, set the box in the bottom left corner to 4 to see it in action.