Red notification window at the top of my wordpress install

I installed marketpress (full version) and now I have a red notification message at the top of the wordpress install with the following message "Easily get updates, support, and one-click WPMU DEV plugin/theme installations right from in your dashboard - install the free WPMU DEV Dashboard plugin. (find out more)"

I don't want to install this on my clients site, so how do I dismiss the message? I don't have a dismiss button. I am a noob so I apologise for the stupid question, I am just new to your community.

Simon