Setting up a custom domain
You can use a custom domain such as releases.mydomain.com instead of using your ReleasePage subdomain.
Setup your custom domain:
Create a CNAME DNS record with your domain name provider and point it to
domains.releasepage.co (every domain name provider has a slightly different way to create CNAME records so you'll need to check with the particular company you're using for instructions).
Create or edit a Release Page and navigate to Settings to insert your custom domain.
DNS records can sometimes take up to 12 hours to propagate.