WPMU DEV Video not implementing

I have installed integrated video tutorials plugin at dearfinder.com using a different wpmu dev username. Since changing my username, I am getting these messages when I try to play a video at this location (http://dearfinder.com/community/learn-about-wordpress-posts/). Access denied. I try registering the domain, but since it was register with the previous username, I cant.

I want to deregister the domain from the previous username settings and enable the domain on the current.

Thanks for your reply