To create an auto-optimization rule go to Rules on the left side of your screen and click + New Rule button.
In the new rule configuration page specify all the required information.
Here you will need to specify the following:
Rule Name: Enter a friendly name that will help you easily identify your rule among others.
Campaigns: Specify the campaigns to which the rule will be assigned. Simply start typing your campaign name and select from the suggested campaign list.
Query: Specify the conditions you want to set to your rule (example below).
Stats Interval: Select the stats interval based on which the triggering conditions will fire the rule action. This can be set to Today, Yesterday, Last 3 days, Last 7 days, Last 14 days and Last 30 days.
Rule Execution Frequency: Select the frequency on which the system will analyze data and execute this rule. This can be set to every 10 mins, 20 mins, 30 mins, 1 hour, 2 hours, 3 hours, 12 hours, daily and weekly.