You can point a custom domain to your Creek website.
Tutorials for specific domain registrars
For all others: Edit the DNS records
If your domain is kdemo.org (just an example domain) then there are two DNS changes to make:
The "www" subdomain should be a CNAME that points to your Creek-hosted domain, in this case: kdemo.creek.fm
The non-www domain (kdemo.org, also known as the apex, @, or the "naked domain") should redirect to: www.kdemo.org
If you need any more help with your domain, please contact us at firstname.lastname@example.org