It can take two hours from the time you register for a course in SIS before that course is displayed in CoursePlus. You may need to start a new session of CoursePlus — by signing out of CoursePlus and back in again — to see newly added courses in your My Courses list.
In order for registered courses to appear, your JHED ID needs to be entered into your CoursePlus account profile. If you do not know what your JHED ID is, you can obtain it from https://my.jh.edu/.