In the appearing screen you can set the CNAME-Record under DNS records.
Name: is the subdomain for example "name" (without the period at the end).
Type: select CNAME as kind of forwarding.
Value: Specify which target is to be achieved: "target-domain.com".
If required, you can additionally set the "TTL" or the "priority" for each entry.
Confirm your settings by click on "Save".