If you would like you customers to access your portal at a subdomain (return.yoursite.com) then this can be done easily.
Obtain your return portal URL. This was sent to you after sign up, and will look something like the below:
If you don't have this then please request from support.
Access Advanced DNS settings
Add CNAME record
Set Host name as return, copy and paste your return portal URL into the Points To field.
The host name must be return
Copy your return portal URL without HTTP://
Remove the / from the end of the URL
Have added the cname to cloudflare
If you need help with any aspects of setup then please don't hesitate to contact our support team.