Enter Domain name, select Domain extention and click modify
Select login as "Technical Contact", enter Technical user ID, password and click "Login"
After login, click "Option 2" (Modify Technical Contact Record)
Go to item 1 (Modify Technical Contact Record), change accordingly and click "Modify" to confirm your change.
Reconfirm your change by whois your domain at:
http://whois.domainregistry.my