If you were a WSU student and have not taken classes elsewhere, you do not need to re-apply as a transfer student. You will need to fill out an intent to return form from the Registrar's Office. You will also want to contact your academic advisor to set up an advising appointment for the upcoming semester.
If you were a WSU student and have taken courses elsewhere and want to return to WSU, you will need to fill out a transfer application. You will not need to pay the transfer application fee a second time. You will need to request official transcripts from all institutions that you have attended to the WSU Admissions Office, P.O. Box 5838, Winona, MN 55987. Your transfer application will be reviewed and you will be contacted regarding your admissions status.