How long does it take to get my work classified and added to the Xepher Newsbox? Or at least that drop-down menu...
That depends, how long does it take you to get around to adding it? :-)
The email you got with your initial password included a link to the help/info page, which had instructions for logging into the account management interface, setting up a forwarding email, and changing your password... it also mentioned going through the rest of the settings. If you login there (https://xepher.net/index.php?page=account) you'll see a link for "Edit Account Info" where you can set your site's title, category, and description. Those will be used by the newsbox, as well as the site directory. If you have trouble, let me know.