I don't know how to find a support group for dissociation, and I may be remembering this incorrectly, but I think my therapist once said there are some people who who spend a lot of time focused on the disorder and others who focus more on functioning. Also, you may have those who want integration and those who don't (I don't), so it's not that easy. That's an oversimplification, but I think what she was pointing at was that you can have people with really different needs and it's hard to find a good match in terms of support.