To update your DNS settings, follow these steps on regery.com:
Log into your user account.
Navigate to Domains -> Actions.
Click on the domain name you wish to modify, which will redirect you to a new page.
Select the DNS Records (Regery) tab.
Add DNS records
You can then add the DNS records provided by Shopify at the bottom of the DNS list:
Add a new record
Specify Type
Click save
Example of Type A record and CMAME
Host: @ Type: A Content: 23.227.38.65
Host: www Type: CNAME Content: shops.myshopify.com.
After making changes, allow 24-48 hours for the updates to take effect globally, though they typically occur within a day. New visitors usually see the changes much quicker than those who have previously visited the domain.