Accessibility with Screen Readers (Exams, Pause Button)

I use the Quiz Maker to create examinations for the courses I create using Storyline 3. I was contacted by a person who uses a JAWS screen reader and informed me that they were unable to select an answer. The questions I use are Graded Questions (multiple choice - select one or select more than one) and involve clicking a box and then clicking submit. 

Are there instructions that I should be including to guide people on how to complete the examination using a screen reader? If so, what are those instructions? 

Additionally, although I have the seek bar displayed, the individual said they were unable to pause the narration. Are there instructions that I can share with individuals who are using screen readers that explain how they engage with the seek bar to pause the narrative? 

Thank you!