Symbols

This is a true noobie question. I am trying to follow this tutorial.
http://hotwired.lycos.com/webmonkey/...?tw=multimedia
When it gets to the creating legs part it says put front and back legs on the walk layer. Down towards the bottom of the same page it says "Now we should have two layers on our "legs" symbol. Not the walk layer?
Secondly later on in the tutorial she bends the legs but since they are symbols I don't see how she can break them.
Since I am writing this in Iowa that may be the problem but I sure would appreciate some help.

thanks!!
jhay