Shamim's Plugins

May you please send me your contact form url?

As i understand you want to restrict message sending between users based on some custom value of each user.
You can use following code

add_filter( 'fep_current_user_can', function( $can, $cap, $id ){
    if ( 'send_new_message_to' != $cap || ! is_user_logged_in() || fep_is_user_blocked() ) {
	return $can;
    }
    //Here check your custom value.
    //sender user id = get_current_user_id()
    //receiver user id = $id
    //return true if this sender can send to this receiver
    //return false if this sender can not send to this receiver
}, 10, 3);

You need to get site key and secret key from google. Please see https://www.shamimsplugins.com/docs/advanced-nocaptcha-recaptcha/getting-started-advanced-nocaptcha-recaptcha/how-to-get-google-recaptcha-keys/

Let me know.

If you need refund don’t worry about it. I will full refund you.

Add following code in your theme’s (child theme’s if you are using) functions.php

add_filter( 'fep_get_option', function( $value, $option ) {
	if ( in_array( $option, ['can-send-to-group', 'allow_attachment'] ) ) {
		if( fep_is_user_admin() ) {
			return true;
		} else {
			return false;
		}
	}
	return $value;
}, 10, 2 );

This will allow to send group message and attachments only by admins.

May you explain “the user could only add himself to a specific group” a little more? Suppose you have 5 groups but you want your users can add themselves only specific 2 groups?

I visited your website and it seems this is not the actual code of your login form.
Please re-check you have added code in appropriate location.

Let me know.

May you please let me know following
1. Version of this plugin, wordpress and php
2. Activate query monitor plugin and see which query taking more time
3. Deactivate all other plugins and activate one of default theme (tweenty*) then test. If it is taking normal time then activate one by one and test.

I think UPT()->get_user_id() is receiver user id in your code. So you can use like fep_current_user_can( 'send_new_message_to', UPT()->get_user_id() )

Then you need to add code in php. Check fep_current_user_can( 'send_new_message' ) before that link output.