To revise an existing course (quarter offered, course component, repeatable for credit, course title, course description) use the Add/Update Course Catalog webform in PeopleSoft.
To revise course scheduling (room assignment, enrollment caps, instructor/TA listing, add/delete a section, instructor consent, time/date, units offered, grading basis) use the CPS CLSS system.
If you need to be granted access to Courses in PeopleSoft, send email to medregistrar@stanford.edu, include your department and role details with your request.