An active subscription to the Custom Domain plan is required for custom domains to work. Please refer to the Custom Domain page for more info.
For the purpose of this guide, we will consider that you want to set up the domain links.yourdomain.com. Make sure that you change this according to your own domain.
Log in to your Domains Dashboard
The Domains Dashboard has two views, the Card and List view. In Card View, click Manage on the domain you wish to update the CNAME records. In List View, click on the cog icon.
Click on DNS & Nameservers in the left-hand menu.
On the DNS & Nameservers page, select the DNS Records tab.
Add a new CNAME Record by clicking the blue + button.
In the window that appears, select the CNAME from the dropdown list.
Type in the DNS record values:
Name: In our example for "links.yourdomain.com" add "links"
TTL: 1 Hour
Then click on the Add DNS button.