The images downloadable from https://www.greenbone.net/en/testnow/ are not Community images. They are trial versions for our Greenbone Enterprise Appliances.
We have a comprehensive manual for our appliances which can be found for the 22.4 release at https://docs.greenbone.net/GSM-Manual/gos-22.04/en/
For displaying the logs you can take a look at https://docs.greenbone.net/GSM-Manual/gos-22.04/en/managing-gos.html#displaying-the-log-files-of-the-appliance