Online Domain Management for .PK domains is now LIVE in client area under your account.  In order to manage your .PK domains, please login to your account at https://www.pakhost.com/login/ and click on menu item "My Domains", here you will see a list of your all domain names.  Click on the right most icon in front of the domain name which you would like to manage.

My Account -> My Domains -> Right Most Icon for Domain Management

Note:  Any DNS changes made will go in effect LIVE immediately and could be verified from PKNIC or http://whois.net.pk websites.