Private Messaging - Insert user_name

Hi there, I literally rejoined WPMUDEV for $50 just so I could ask this question. I really appreciate your hard work on your themes and plugins.

1. I would like to use the [pm_user in_the_loop="1" text="Compose"] and it open a new window where the user can submit an email. Unfortunately it doesn't work on my page. You can see it here: http://pixfli.com/listing/dronephotographydenver/

I have used user_name and user_id and neither work.

I'm sorry but could you please help me with this. This is the last difficult thing i need to do before i can finish my site.

thanks!