Use this tutorial if you have already applied a template to a domain, but would like to remove it. This step is also necessary before deleting a template.
1. Click Domains
Select Managed DNS and click on Domains.
2. Select Your Domain
3. Click Apply Template
Select the Advanced Settings menu, click on Apply Template from the drop down menu.
4. Apply "None"
Click on the drop-down menu and select None. This will remove your current template.