When you access your Rally Admin at https://admin.onrally.com/ you will be able to see the 'Analytics' tab. Click there to view your analytics for all purchases and Post Purchase Offers.
Once you're in the analytics tab, you can view your overall analytics, or you can specifically search for a Funnel to view funnel specific analytics. To do that, you will type the name of the funnel into the search bar.
You can also filter the time frame you are looking at by changing the time frame at the right hand side of the search bar.
You can then view the details of the specific funnel analytics.