Please set the permission of guests and administrators after installing the add-on.
A permission allows you to choose which users are not affected by this restriction.
An option allows you to choose which thread to read, if you set the value of this option to 0 the feature is disabled (by default, this is set to 0).
The restriction is carried out on the whole forum (except the administration) whatever the page.
You can change the title and error message via these two sentences :