If you installed the Stackit extension from your mobile Chrome browser, then you'll need to enable the extension the next time you're on your computer. Here are the steps:
Go to the Chrome desktop browser and select the kebab menu (the three vertical dots in the top right).
Click on StackitTM from LendingClub was added remotely at the top of the dropdown menu.
In the next popup, select Enable extension.
Log in with your LendingClub account.
The Stackit extension is now enabled on your Chrome desktop browser. The next time you visit a merchant in the Stackit network, you'll see an extension pop-up asking you to activate a cash back offer.