Digital Navigators for Acceptance and Competence Development with Mental Health Apps

The goal of this clinical trial is to learn if and how so called "Digital Navigators" (DN) can help general practitioners, outpatient psychiatrists and psychologists as well as their treated patients to use digital mental health apps (DiGAs) and integrate it into their treatment. The main questions it aims to answer are: * What are the chances and implementation barriers of DN? * What are the acceptance and expectations towards DN? * Do DN affect the psychological health of patients? * Do DN affect the digital health literacy and technical competence of participants? Employees of medical teams (e.g. medical assistants) receive training to become a DN. Afterwards patients are accompanied and supported by the DN for 12 weeks to select and use a suitable app for their mental disorder.