First, you have to find a faculty member who is willing to supervise such a course for you. After that you must do two things. You must fill out the online tutorial enrollment survey here. Also you must add the course to your course sheet, being sure to request instructor permission. Note that some of the information you will need to complete the survey will require discussing the topic of your research and what you will do as a research assistant. Keep in mind that the workload for this course must be equivalent to other courses offered at Yale. You and your faculty member should also agree upon the basis of your evaluation (i.e., what you will be graded on). Once you two agree on the plans, fill out the survey and add the course as described above.