Problem with my subdomain

Problem with my subdomain

Hi,
i have changed registrar for my domain but i haven't copied my link for my subdomain actviced on ZOHO DESK
the domain was support.drcomputers.eu
user drcomputers73 
email supporto@drcomputers.eu

can you help me 
i have the new domain with subdomain but i don't remember the cname i have to use

Regards