i am a bit confused with what i have. I was using

i am a bit confused with what i have. I was using the godaddy dashboard (my site http://www.ranchocasares.com is hosted by them) and presumably have two dashboards; there is the "dashboard" tab and just below it the "WPMU DEV" tab. I am not sure how the two relate. Furthermore, i am not sure how to load the themes, for they do not appear to load - at least that is my impression after loading them and then going to my site and not seeing the new theme. Please help!