Quiz Directions

I am trying to figure out how some stuff works. I have added a content for Quiz Directions and when viewing it, it shows the Next button at the end. I assume this should go to the actual Question the text refers to. In my example, I am giving instructions on how the student should prepare (what to read) before answering a long question. I cannot figure out how to link the directions with the question.

Also, if I create an assignment outside a course, how can I later add this assignment to a course?

Thanks!