Custom domain
All stories are shown on StorifyMe domain by default (eg. storifyme.com).
If you want to start showing stories on your company domain (eg. stories.mydomain.com), you would need to setup custom domain.

Once a domain is added, you would be able to verify Google domain HTML tag, if you need to submit the sitemap.xml to Google Search Console.
For app links that open stories in a customer's iOS or Android app, see Mobile app links on custom domains.
info
After configuring CNAME records on your side, it might take up to 1 day for DNS changes to propagate and your domain to start working.