The article is relevant for instructors and course designers
Adding the Inclusive access materials to the course is often times just a question of "Which provider do you use?"
Is it the Vital Source stuff? If so, then just click the Course and Institution tools link on the right:
On the panel that opens up on the right, scroll down just a bit and click the little + sign by the Vital Source tool:
If you are not referring to the Vital Source tool then scroll all the way to the bottom of that panel and click to browse all tools:
You can use anything that is there, but we are not advised on which course uses which tool.