Shamim Hasan, Thank you! It works!
If smb needs the link to feel up the Subject field and To whom it will be send, here is the code:
<a href="<?php get_bloginfo("wpurl");?>/<em>your-link-to-the-plugin-page</em>/?fepaction=newmessage&to=<?php the_author_meta("user_login");?>&message_title=<?php single_post_title(); ?>">Ask a Question</a>
It works perfectly with woocommerce on the single product page =)
