Redirect to "create a new private message"

When I click on "PM" button on the forum next to a username, I want to be taken to my privatemsg interface and have a new message open, with username already filled in. (I have privatemsg5x-2x-dev module).

To have that work, in the file .htaccess placed in my phpbb (actual discussion board, not integration module) i replaced

  RewriteCond %{QUERY_STRING} ^mode=post&u=(.*)$
  RewriteRule ^privmsg.php(.*)$ ../privatemsg/msgto/%1 [L] 

by

  RewriteCond %{QUERY_STRING} ^mode=post&u=(.*)$
  RewriteRule ^privmsg.php(.*)$ ../privatemsg/new/%1 [L]