There are several ways to find help that’s local to you.
1) Use the FitnessConnect feature on this site and search for an instructor in your zip code.
2) Go to Zumba.com and search under their “find an instructor.”
3) There are facebook pages for Zumba in just about every major city. Join or follow a facebook page for Zumba in your area and post your request.
I do a lot of volunteer classes, but I’m in Oregon.
This might also be useful to you. It’s about events, but I think instructors probably look here, too.