My Book® Essential Edition denied access

I’m having issues accessing MY BOOK - ACCESS DENIED.

I change the “security” settings under “sharing” to hopefully set a password so ONLY I could access my external “My Book Essentials” by going into the Properties, then Security, then taking out “EVERYONE” and left only me : “USER: my name here”  and it immediately blocked my ability to pull the files up by going to My Computer, G: , then My Book…

I went into “properties” and instead of seeing about 10 tabs now I only see about 5…“Security” is no longer one of them.

I only have “sharing” to work with and I took several steps to try to add “Administrator” (aka me!!), “USERS”, “SYSTEM”, etc. but non of the steps I took worked. How do I regain access to my book through my computer?