Step 1 . Set CNAME DNS record to map your own domain to pbcdn2.podbean.com.
We recommend you to use CloudFlare.com for your DNS service. You may check how to set CNAME in cloudflare.com here.
If your domain is registered with GoDaddy, you may check how to set CNAME in GoDaddy here.
Step 2: Set your own domain in your Podbean account
Log into your Podbean account, click the "Own Domain" under 'Settings' tab.
Fill your own domain in Step 2 . If you want to use www.mydomain.com, then fill the own domain field with "www.mydomain.com". If you want to use podcast.mydomain.com, then fill the own domain field with "podcast.mydomain.com".