Shamim's Plugins

Other things layout working? Eg. Messagebox?

any php page? post can have author but every php page does not have author, So how will you get author if do not have one?
Do you want to send message to a constant author?

If i understand you correctly can you put what suggested here https://www.shamimsplugins.com/docs/front-end-pm/customization/user-name-pre-populate-new-message/

Change USER with get_the_author_meta( 'user_nicename')

There is settings to hide directory. go to Front End PM > Settings > General and check “Hide Directory from front end?” then save

as you have inserted php code via a plugin so i do not know which shortcode used for nicename.

Please go to Front End PM > Settings > Licenses then remove your license code then save again input your license code and again save

Please check now.

Thank you again.
You can give me translated files, i will make an option where everybody can download this translated files

assuming your php version 5.3+ and wordpress version 4.4+

Use following code in your theme’s functions.php

add_filter( 'fep_directory_arguments', function( $args ){
	
	$args['role__not_in'] = array( 'subscriber' );
	
	return $args;
});

Change ‘subscriber’ to any role you want. You can use multiple roles also