Fish extenders are handled through your cruise meet group. Here's a link to your cruise's group:
http://www.disboards.com/threads/january-6-2017-3-day-dream.3463885/page-2
It looks like someone recently was told to PM lilybug12. You can do that after you have 10 posts.
This is really late to be joining a FE group. Groups usually close about a month before the cruise in order for people to get their gifts together. There are sometimes "last minute" groups so maybe you'll find one.