Instuctor and Video Playing sideways

How do I select an instructor for a course if it doesn't give me an option to select anybody? Also, I have a Q&A Video Tab/Course. The video plays fine when I embed it into a wordpress post but it plays sideways (horizontal) in the course. On the mobile version of the website, the login page is not line up correctly. I would like for it to either be center alignment or left alignment.