Step -1: Open DNS Manager:
Go to Server Manager and Click Tools and then Select DNS option.
Step -2: Expand the Server option and Select Forward lookup zone.
Step -3: Select the website that you wish to Modify or Add the DNS record
Step -4: Right click and Select New host (A Record) or Alias (CNAME) or Mail Exchanger (MX) record.
Step -5: Add the record details and Click Add host.