Step 1: Change your DNS records in your third-party domain provider account

1. On your domain provider’s website, log in to your account.
2. Find the DNS settings or domain management area.
3. Change the following records:
   1. Point the A record to the Shopify IP address 23.227.38.65.
   2. If necessary, change the Host name to the @ symbol.
   3. Delete any other A records on the domain if there are any present.
   4. Point the CNAME record with the name www to shops.myshopify.com.
4. Save your changes.

Note

You don’t need to change the TTL number in your DNS settings. Use the default value.

https://help.shopify.com/en/manual/domains/add-a-domain/connecting-domains/connect-domain-manual