Unfortunately, they're not allowing the public to edit the content. I hope they will at least open it up to registered users in some way. It's also somewhat disappointing that the organization of Who's Who in Hell puts all the entries into 26 wiki pages, one per letter of the alphabet, rather than having a separate entry for each person. My entry on the L page is woefully out of date.
UPDATE: But they're quite responsive... I have a new entry already.