Need help in changing a SD incident Close time to 1 hour after it is resloved

I am the new administrator for our Service Desk 7.5.  It will be the first time that I will be using the Process Manager or Work Flow.  Our Service Desk Supervisor is requesting for the closure time to be changed to an hour after an incident is resloved. 

I have been trying to locate it in the Process Manager\Admin\Automation Rules to set to an hour for closing of the incident.  I am not sure if that is the right place to look.  I see the SLA Levels for Initial Reponse and Resloution-Late. 

I have also looked around the Admin menu and not finding where to set the resloved ticket to close within an hour.

Where would I go to change the closure time?

Thanks

mvelez