When you are registered, they normally send out an email in advance with the date that it starts. I think there is at least six a year. Rules are pretty simple, just go to the member area and click on the "Shops not visited" link and it will list the links for all the sites. Click on the links, any order you want (I usually start from the top and work my way down) Tey usually will have a hint on the particular site on where to find the bunny. Once found, click on the "You Found It" bunny and it should bring you to the hop registration page, make sure you click it to register your find. Then continue to the next. You have the full month for the hops. And like many others have posted, if I can't find it right away, I go to the next site. Lots of the sites will put it on their newsletter sign-up page, so I go there if a hint isn't given.
Hope I helped somewhat, besides being long winded.