More tag protection message not displaying

Hi there.

I'm new with your plugin.
I want to protect my content under the "read more" tag, but the protection message is not displaying. For exemple on this page.
When I protect content with shortcodes, like here, it works properly.

By the way, is it possible to hide these shortcodes ? I don't want my readers to see them on my posts when they are registred.

Do you plan to issue some documentation ? It's sometimes really hard to figures out how all this works !

Many thanks for your help.
Best,
Yan