Update README.md

Sources/SIS/README.md

@@ -36,5 +36,5 @@ To restart the containers after the initial startup and database setup, run
 
 The application will be available at http://localhost:3000. To add / modify
 users, go to http://localhost:3000/users. To add/modify courses, go to
-http://localhost:3000/courses. To enroll students in courses, use the "Edit" button on the users page. Set the checkboxes for the courses you want that student to be enrolled in.
+http://localhost:3000/courses. To enroll students in courses, use the "Edit" button on the users page. Set the checkboxes for the courses you want that student to be enrolled in, and click the "Update User" button.