You can follow these steps to delete an action from a rule in your report template.
Navigate to the Templates page.
Click on the Edit template icon next to the template containing the rule you want to delete a rule action in.
You should now be able to see the Edit Template page. Click the row for the rule you want to edit in the Rules section.
Hover over the rule action you want to delete and click the Delete button that appears.
Note that multiple buttons will appear for nested actions, each button will delete all actions and conditions within the dotted gray box it is touching.
Test your report and publish your changes once you are happy with them.