If a user has not opted into the player directory, you cannot find them through it. If they aren't active on the forum, you won't be able to find them to send them a PM either. If you're trying to contact a marketplace artist, you can send an email to <a href="mailto:team@roll20.net" rel="nofollow">team@roll20.net</a> with the name of the artist you want to contact and what you'd like to send them and they can see that the artist is notified. You can also just post in the General forum asking that artist an open question and they may see it or other artists that know them may direct them to that post.