The Lookback Feature is exclusive to the Pattern Finder Platinum (annual subscription).
You can upgrade your Pattern Finder account directly from the Account tab under the Subscriptions section by clicking “Change Plan”.
If you would like to upgrade your Pattern Finder subscription to access the Lookback Feature, and you are not seeing the "Change Plan" option on the Subscriptions section of the Account tab, please email our Support team and they will be more than happy to help you through the upgrade process.