To create a new user or change your current preferences, use the Quick Preferences Form.
When you visit a story page hosted at ficml.org, your style and header preferences will be applied, using a cookie. If cookies are off or your cookie isn't present (for example, if you're using a new browser), you can type your username in the form box on the story page to have your preferences applied.
Try the demo story to see how it works.
If you have a FicML username and a blog or LiveJournal, you can save your blogging information for use with various FicML tools. To set your blog preferences, visit the blog settings page.