Shortcode help

Using Front End Only Users plugin v. 2.6.10

The documentation says “Type the shortcode name and help (ex:[login help) in any WordPress page to get a complete list of the shortcode’s attributes.”

First of all, is it (ex:[login help]) (missing ‘]’)? Second, how do I use it? Do I just write [login help] on an empty page, and then view that page in a browser? In that case, it is not working. It just displays a login form, no help.

By the way, it would be VERY helpful with a written list of all attributes to all shortcodes.

https://ww.wp.xz.cn/plugins/front-end-only-users/