Add WPMU DEV dashboard to a new website

Hi all,
I just began a new Wordpress site that will have a Simplemarket theme. Tried to install a new copy of the WPMU DEV Dashboard plugin into the dashboard of the new site, but ran into snags when it told me my info was already being used (yes because it's mine). How do I now access you from a new Wordpress install?
Thx
Barb