Can I add multiple users to a tablet...

[AC Question]

I bought an off brand tablet for my pre-teen about two years ago. I am trying to add another user so she doesn't have access to my info/email. I think I am using Android KitKat OS...under version it says 4.4.2 (my apologies I'm not as tech savvy as I would like to be). I have read a bit and some other sites have said that under the DEVICE heading under SETTINGS it should say Users...this one doesn't.

Is there a way that I can update this tablet or am I just out of luck?