Access music collection on QNAP NAS

My whole collection is on a QNAP NAS.
I can't get QSubsonic installed and I can't access the NAS.
I do not get the NAS drive displayed.
What should I do?
Version 6.1.6 (build 0cfa60) – 10. November 2019
Server jetty-6.1.x, java 1.8.0_152, HSQLDB, Windows 10 (96,2 MB / 145,0 MB)
I can't get QSubsonic installed and I can't access the NAS.
I do not get the NAS drive displayed.
What should I do?
Version 6.1.6 (build 0cfa60) – 10. November 2019
Server jetty-6.1.x, java 1.8.0_152, HSQLDB, Windows 10 (96,2 MB / 145,0 MB)