1.)
Click the arm of your character. Goto Insert
> Convert to Symbol.
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2.)
Now choose Movie Clip, and name your characters symbol
arm. Click ok. Then insert
keyframe on 5 and 10 then select all the frames, right click and Create Motion Tween.
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3.)
On frame 5, move your arm and rotate it a bit, just
like I did above (the left pic). Here is where it gets
a little tricky, but its how I do it. Now on frame 9
Insert Keyframe, then on frame 10 Remove
Frame (the right pic).
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4.)
Publish your animation and now you got a character moving
his/her arm and if you did the last lesson you have
him/her blinking as well. Next lesson you will learn
how to make your character walk!