How can I reset share passwords for WD Sharespace using root in SSH?

I have a Western Digital ShareSpace Disk Array NAS (Same one in this manual : https://docs.rs-online.com/49a1/0900766b80ce7e97.pdf )

The system has an existing number of shares, with a lot of files and data. Each share was created through the web interface of the NAS and each has its own username and password.

I am able to login to the NAS SSH interface (as root) and when I run the command

less /etc/passwd

I can see the share usernames listed. I have the ability to change the password for any of them using

passwd [any_share_username_here]

and the change is done. But when I try to mount the share from Windows, I am prompted to enter the username and password. The new password I entered in SSH does not seem to work.

I guess the NAS has a separate credentials for accessing the share, and a different password for SSH.

Is there a way (from SSH) to alter or remove the password or create a new share the is can be exposed to Windows?

Can I reset the admin password used to login to the web interface?

EDIT: just to clarify: I already have access to the share volumes from SSH, and I can browse all of the data. I just need to be able to map to the volumes from Windows, but I can't because I don't reset the password without the web interface.