You may change DNS servers list (delegate domain) and launch DNS servers testing procedure in your personal account in the "Active Services" → Domains" section.
Domain delegation means placement of DNS servers list with the domain technical records (zone file) to DNS servers enabling top level domains functioning. Delegation is a prerequisite for site and mail operation on the domain.
DNS Servers List for Rucenter Services Functioning
Delegation Periods, Suspending/Unsuspending
Within the whole domain registration period the Registrant may suspend delegation in your personal account in the "Active Services" → Domains" section (for gTLDs and ccTLDs the domain should be delegated with an empty DNS servers list).
Earlier suspended domain will be unsuspended subject to domains delegation periods.
Domains delegation periods are subject to the moment the modifications are made:
Important! A delegation request for .RU and .РФ TLDs will be processed, unless Rucenter verifies the ability to contact Registrant by a registry held phone number with SMS support.
DNS Servers Testing
During domain delegation the specified DNS servers may be checked for operation. If testing proves successful the domain will be delegated with the new DNS servers.
More about DNS servers testing
How to Complete DNS Servers List
For DNS servers, which name contains the domain name to be delegated (child DNS server) IP address should be specified; .PRO domain supports only IPv4; For .ORG domains delegation with child DNS servers different IP addresses need to be specified.