From June 2003 till November 2018, bookcrossers.eu has been the German Supportsite for BookCrossing.com , which existed in English only for the most of that time. Now that BookCrossing.com speaks several languages (including German and Dutch), the Supportsite has become obsolete.
So, for all information you will now be directed to the official BookCrossing.com
BookCrossing Supportseite