Your U.P.-membership automatically becomes a donorship when you graduate or when you stop with your studies. You will still pay €11 a year, the same as when you were a member. As a donor you will not receive a membersmail.
Do you not want to be a donor anymore? Send an email to firstname.lastname@example.org. It is possible to disenroll untill the 1st of October as a donor of U.P. After the 1st of October you will have to pay your contribution of the year.
After graduation you can also enroll as a reunionist, Being a reunionist costs €15 a year. For more information check reunionist policy