How so I create a new site - as part os a multisite set up?

Hi,

I would to add a new site for my self as a subdomain so it shows up here: http://screencast.com/t/MrsDjMPq

Currently when I try to add it shows up as part of the Pro Sites sites like here: http://screencast.com/t/xj6RADT3fCz
Thats problematic as I need to install a completely different theme.

I hope my question is clear.

Thanks,
Justin