A custom subdomain is something like links.mywebsite.com.
Login to your Shopify admin
Click on "Online Store"
Click on Domains
Next to your Primary domain, click the Manage button
At the top of the screen, click "DNS settings"
Click the "Add custom record" dropdown and select "CNAME record"
In Name enter your your subdomain. If you want links.mywebsite.com, enter links. If you want bio.mywebsite.com enter bio
In Points to enter beacons.fly.dev
If you have any questions, please contact our creator support
team by emailing email@example.com.