Hey,
This is the community forum, so if you need help with a specific problem, you could post a description with some logs or screenshots, and then maybe someone from the community can help.
If you need help in a more general sense, you should contact Mendix, or any of their partners, about receiving support from some consultants/developers.
If you believe you are running into a bug, originating from Mendix, then you should open a support ticket.