Its not actually possible to enter on-line as yet, maybe 2009 sorry, the fees involved can add up to almost as much as is paid for rider insurance, and keeps race entry fees low.
Pre-entry has to be by old fashioned Snail Mail for now unfortunately.
Entry form is here
http://images.numplumz.multiply.com/attachment/0/SAXtOQoKCCQAAE6EUdg1/FridayNightSummer2008form