To do this, navigate in DATEV Unternehmen Online to Administration > Rights Management > DATEVUnternehmen online (formerly known as DATEVconnect online).
DATEV offers a helpful click tutorial and further documentation for this purpose:
https://datev.readyplace.net/public/tutorial/5faa6f6ca475a2006a1f4d9c?op=start
https://apps.datev.de/help-center/documents/1071428
You can find more information about the DATEV connection in our blog article and in our step-by-step instructions.