Did you configure your printer to work with Google Cloud print? Did you install the K-9 email client?
Once those 2 things are installed/configured then you can add your email accounts to the K-9 email app, open the email you want to print, then Menu->More->Share and one of the Share options will be Cloud Print. Select that and you will be prompted to click on "Print" and the email will be sent to the Google Cloud print server then downloaded to your PC then printed to your printer. Whew!