Please use this button to send private messages to a certain user:
(https://www.vlsroulette.com/proxy.php?request=nolinks%3A%2F%2Fvlsroulette.com%2Fforum%2F%2FButtons%2FEnglish%2Fmessage.png&hash=9b619591b7e4039a70b7c1cbd43721a8fe70e287)
You can find it both at the user's profile and at every post from that user.
Or you could simply go here:
nolinks://vlsroulette.com/forum/YaBB.pl?action=imsend
And fill the user's nickname manually.
This should do.
Regards.