You can change the semester either on the login page or on any page within P. O. Box. For example, if it's July 12 and you want to send a note to the students enrolled in your fall class, change the semester from the current summer semester to the upcoming fall semester.
If you select the correct semester and still don't see your class list, work with your department's scheduling contact person (listed by the Office of the Registrar at http://www.udel.edu/registrar/faculty_staff/dept_contacts.html) to verify that your course information is correct.
In general, P.O. Box class mailing lists are available for the current semester, at least two previous semesters, and one future semester. You can send messages to students in your classes for all semesters listed. However, you can only send messages to major lists for the current semester and previous semesters.
By choosing a previous semester or the current semester, you can send a message to majors based on the selected semester. Alternatively, you can wait until the future semester becomes the current semester as described in the answer to question 3 above.
The "sustaining" and "nonsustaining" lists differentiate between graduate students with and without "sustaining" funds. Therefore, you might see three lists for a major's graduate students. For example: