You need to head over to the main Cruise Meet board:
https://www.disboards.com/forums/disney-cruise-meets.85/
and start your Cruise Meet thread there. Be sure to title it with the ship name and dates of cruise. The message doesn't have to be fancy. A simple "Here's our cruise meet thread" works. Or you could introduce yourself.
Then, copy the URL (at the top of the thread that you've started) and come back here. Make a new post here asking to have your link added to the first post.
Be sure to paste the copied URL into your request post.
Then, one of the mods will be along to add it to the list, making it easier for others on your cruise to find it and get things going.
Good luck.