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.
In a hole in the ground there lived a hobbit. Not a nasty, dirty, wet hole, filled with the ends of
worms and an oozy smell, nor yet a dry, bare, sandy hole with nothing in it to sit down on or to
eat: it was a hobbit-hole, and that means comfort. — JRR Tolkien
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