BuddyPress.org

Add this snippet to your child-theme functions.php or bp-custom.php

Nedds also a template overload of
/your-theme/content.php
as you should add an action or the function call near the (blog) post.

function bpfr_pm_to_author() {	

	$author = get_the_author();

	echo '<a href="'.wp_nonce_url( bp_loggedin_user_domain() . bp_get_messages_slug() . '/compose/?r=' . get_the_author() ) .' title="Private Message"">Private Message</a>';
} 

DanBp,
this helped me too. Thank you very much!

Is it possible to have something like that to put a “send private message” on product page (whoocommerce) to private message the User who upload product?
thank you!