Once your enrollment dates post for an upcoming semester, you'll receive an email from the Office of the Registrar. The dates will also be ailable on Buff Portal's enrollment dates card (you may be prompted to log in).
After your enrollment dates end, registration remains open for current undergrad and grad students until the date specified on the registration calendar.
Once registration closes, you'll need to wait until the either the schedule adjustment period (fall registration only) or the open enrollment period to change your schedule.