to post a story on Literotica, follow these steps (believe me, with 74 submissions under my belt I know what I'm doing)
1) go to the story index page of lit
2) click "Login" at the top of the page
3) go to "Submissions" - an option on the left hand side
4) click "Submit A Story"
5) Click the "I Agree" box, fill in the title, description, and as many keywords as you can think of, upload or paste the story, and click "Submit"
It'll take up to a week to get the story up and running, but you'll be on your way = )