Ah, got it. I should have read more before asking. Is the phrase View Details & Register hard coded?Go to ACP->Users->Administrators and give what ever admin you're accessing the ACP with 'Administer Raffles' permission.
That's step 4 in the README.txt file.
http://snogssite.com/forum/index.php?raffles/
Also, when I clicked Raffle Details in the navigation bar, which has raffle id at the end like this:
http://snogssite.com/forum/index.php?raffles-details&raffle_id=1/
I got a "Page Not Found" error on my website. It seems to works fine on your website though.