An appointment for the personal enrollment for winter semester 2018/19 is only required until 28th September 2018.
For degree programmes with admission restrictions be sure to meet the enrolment deadline, stated in the enrolment application document (Immatrikulationsantrag)!
More appointments for personal enrolment will be released progressively.
The booking of the appointment will not work until you "request enrolment" in campo.
The username is the applicant number (Bewerbernummer) as shown on your enrolment application document.