Private Page Options doesn't appear

I’m trying to create a private page, but I see according to the screen shots I should get a “private pages option” widget on the right hand side of my pages edit screen. I don’t see that so I don’t know how I’m going to use the plugin! I first tried this w/o the sideways8 Login plugin activated then I thought maybe I needed it so I activated it, but it still didn’t help (although I didn’t change any settings.) This might be a “duh” problem, but any help would be great!

https://wordpress.org/plugins/s8-private-pages/