Hi,
To connect your .PK Domain to Shopify first login to your .PK DNS Account provided at the time of registration.
After logging in go to My Domains > Manage Domains and click on your domain name showing in blue
Upon click a new page will open scroll down and you will see this option
Modify A/CNAME/TXT in front of DNS Records
Click on it and enter Shopify A record and CNAME record as follows
A record IP 23.227.38.65
CNAME Sub-domain: www
CNAME Host: shops.myshopify.com
Once done wait few hours for DNS propagation.
Regards,
Domain.pk Support Team