To apply for a loan from the AStA, you must be enrolled at the university.
You always need a guarantor, i.e. a person who repays the loan if you are unable to do so.
The application forms (you need: Angabenformular-General + Antrag-Darlehen + Anlage-Bürgschaftserklärung) and the associated statutes can be found in our XWiki for download.