How to replace a story?

OK, I know that I could have just asked you, Erin, directly but you are so busy I was hoping to avoid bothering you, so I'm not in trouble, right?

So, I have done a revision to one of my stories and would like to erase the old one and download the new on in it's place.

I think I can just get in there and highlight the old story, press "Delete" and copy and past the new one in, right?

Gwen