Custom Domains are only available on the Agency plan. If you are on Agency, please follow the instructions below. If you are not, then you can upgrade by going to https://paperform.co/account/billing.
Custom Domain set-up is available for Admin and Owner users of an Agency account.
If you are a sub-user and your account type is User or Viewer, you must ask someone with appropriate permission to process this request on your behalf.
Note, if you use CloudFlare to manage your domain name, use DNS only for your CNAME, not the HTTP Proxy.