If an editor is assigned to a given category, their name is at the bottom of the category, but beware, that information is misleading: no editor has exclusive rights to a category. Any editor in a category direcrtly about it in the tree can edit there, as can the more than 200 editors with Editall or Meta editing designations.
You should not contact the eidtor directly. If you believe that the URL needs to be updated, you should go to the category where it is listed, and select 'Update URL" and describe your proposed change.
Vanity changes rarely get accepted, nor do attempts to keyword stuff the title or description. If the update request points out a factual error/omission, it will receive due consideration.