Research which universities and colleges offer M.Sc. programs and degrees. Once you have narrowed down the field to a few institutions, you can begin the application process, many of which can be completed online.
Complete the application and submit all the supplementary materials required; this includes a personal statement, letters of recommendation, samples of scientific writing and General Record Examination (GRE) scores.
Wait to hear which programs you have been accepted to; once you are accepted, you can enroll in classes.
Look to see what courses are available for your M.Sc. degree; most universities and colleges offer online student services that allow them to check for and enroll in courses. Determine what classes you need and enroll in those classes.