Hello carin,
and thank you for your irony, this helps us a lot.
Category description field work like other fields. if it's in a position, it will be displayed, that's all.
In the screenshot of the manual, the description is not displayed in the frontend because like i said in my last post, Joomla wysiwyg need good right to be displayed. Like you see on the screenshot, the user is not logged and by default Joomla wysiwyg is not displayed for guest.
It's not a SEBLOD problem, but a Wysiwyg feature. SEBLOD work like Joomla work, so to work with SEBLOD you must first know how Joomla work.
Regards.
Lionel