To delete a child domain in v2.0 or newer, go in to manage the parent domain.
Replace 192.168.100.10 with your VPS/Dedicated server IP Address, and example.com with your parent domain.
Thank you for your help hennaboy.
Support said the same. They also said "The default naming convention can't be changed as it is used in several places..."
I was able to get it done by adding a user manually in the database named cy…