How to mount NTFS drives to rockstor

Hello there,
I have 1.25TB of data in 2x500gb(NTFS)[FULL], single 250gb(NTFS)[FULL] drives, and a single 250gb(rockstor installed in this) drive. I installed rockstor in 250gb drive as the other 3 were jam-packed with only left storage was 1gb. After successful rockstor on my machine, I want to mount 3 of the drives. The problem is 3 of them are full and are in NTFS as I was using normal windows. I don’t want to lose any data as it will create a loss and I am not in a position to buy new (as few forums say buy a new one and make a copy in a different file system). So the only option left is to mount it to rockstor. I am getting lots of trouble like
Command: mount dev/sdbX /mnt (X=1,2,3,4)
Error Message: mount: special device dev/sdbX does not exist (X=1,2,3,4)
I also installed ntfs-3g and used this
Command: /dev/sdbX /LOCATION (X=1,2,3,4) and returned this
Error Message: -bash /dev/sdbX: Permission denied (X=1,2,3,4)
I even tried to use chmod 777 it ran successfully but again it returned the same
Command: lsblk Shows correct drives and partitions
I would provide you some screenshots but system shell doesn’t work in my laptop it says

If possible please please provide steps so I can Follow.
I hope I made clear explanation
Thanks for your help in advance.