To edit an existing rule’s conditions and actions, just click on the rule in question to activate the editing options menu.
Upon clicking on edit, the system will display the general conditions and actions tabs window so you can make the desired edit.
If you want to enable or disable an existing rule, you just have to click on each of the rules’ enabled button. Keep in mind that once a rule is disabled, it will no longer have any effect when sending notifications.
Note: After making any kind of edit, make sure you save your changes to implement them.