Register the sales order service

Hi, I am trying to walk through an example of connecting to the sales order services in AX 2012. It tells me the sales order service must be registered. The issue is, when I go to the Checklists System administration > Setup > Checklists > Initialization checklist. I am not able to expand Initialize system node. It has an [x] by it. so I can not go to the Set up Application Integration enable the service. Would anyone be able to tell me why that option may not be active?