If you want to carry out a period of internship at the Autonomous University of Barcelona you need that some entity (department/Library/Research Center, etc) accepts that you do a Traineeship with them. If they accept you must sign your Learning agreement Traineeships and an agreement between you, your university and the entity where you perform the Traineeship.
So you should contact the entity where you want to perform the Traineeship and get someone to accept you.
Area of international relations, the offices of Exchange and the Servei d'Ocupabilitat we don’t take care of the incoming students who wish to carry out internships in the university.
In case any entity accepts you, you must have medical insurance, accidents, repatriation and civil liability.