This is not theme specific, which is why it was moved. ;) It would be the same answer for any theme - even if you were not using Genesis.
Go to the wordpress plugins repository. Search for "top posts".
These forums were CLOSED to new posts on November 19th, 2012. New forums are here: http://www.studiopress.com/forums/
and you will need to SIGN UP AGAIN.
If you need assitance with setting up your theme, go to http://my.studiopress.com/
and read the SETUP links or the TUTORIALS link on the side tab.
If you need Account Assistance
, file a help desk ticket at the same location.