The "Integrating External Services" topic assumes you know how to create a service:

https://docs.openshift.com/enterprise/3.0/dev_guide/integrating_external_services.html#creating-the-service

The example of how to create an object and upload it to your OS instance is outlined in the "Templates" topic:

https://docs.openshift.com/enterprise/3.0/dev_guide/templates.html#creating-resources-from-a-template

I suggest:

-- Making the process outlined in a central location that isn't specific to an object. Maybe in the architecture section.
-- In each topic where the reader is expected to create an object, link back to that process.
-- Each topic (pretty much) would have to be checked.

I have heard that this process will disappear soon though, but at the moment, it's not intuitive enough for new readers.