For starters, I moved your topic to Questions and Answers in the Welcome Mat -- this is because Ask An Expert is more for writing-related questions, and Questions and Answers is for questions about the site. No problem for getting the two mixed up, it's fine!
As for how to edit a story you've posted, if you look at the side of a work you've posted, under "Tools" there should be a white button that says "Edit Work"! It's right under your avatar and the buttons that say "Share on Facebook/Twitter".
It's not your fault ^^ You're new to the site, it might take you a while to get settled in, so don't feel bad about having to ask questions! Even things that might seem obvious in hindsight can be confusing when you're just starting out.
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