How to remove mount point in Nas4Free?

Question

NAS

I installed nas4free, assembled a software RAID1, added a mount point and 2 partitions via the web GUI, got confused in the settings and decided to start over, rolled back the configuration to the beginning, the mount point is not displayed, but when I try to format the disks, it says that you need to delete the mount point before continuing , I think deleting from the command line will help, tell me how to do it?