Submit the hostname that is being held captive.
Verify the hostname by adding a couple of DNS records to your zone. Once the hostname has been verified, it will automatically be liberated after a couple of minutes.
Once the hostname has been liberated (you can check the status below), delete the DNS records you added for verification and point the hostname to your new provider.
Note: You may have to repeat the liberation process for both the apex domain and www sub-domain. E.g. example.com and www.example.com.
Wait for the Custom Hostname verification to complete. If you created the DNS records within the first few minutes, verification should complete almost immediately. You can check the status here. Please wait up to 5 minutes after the status says "liberated".