If you no longer need an existing content rule, you can
  delete it.
    If there is a chance you might need the rule again, you may want to edit the rule and make use of the option to disable it instead.
You cannot delete a rule inherited from a parent space.
- Navigate to the space containing the rule you want to delete.
- In the More Actions menu, click Manage Content Rules.
- 
        On the Content Rules page, locate the rule
        you want to delete and click  (Delete). A
        message prompts you to confirm the deletion of the selected
        rule. (Delete). A
        message prompts you to confirm the deletion of the selected
        rule.
- Click Yes.
- Click Close to return to the current space.
