You're on it :)
After logging in to your Gamefound account and getting into the Grimcoven project, you'll be able to see your pledge from the crowdfunding stage.
You should be able to find it here: https://gamefound.com/users/myprojects -> view your pledge button
From there, you can finalize it with the content you backed during the crowdfunding, add new items, or change the pledge content (the instructions for pledge changes you can find below). You can also browse through the project and if you like any of the pledges, expansions, or addons, click the "add to pledge" button. Once you have everything you want, you can finalize the pledge by providing the shipment information and processing the final payment (the difference between the final value of your pledge, including the shipment, and the initial payment of yours that was collected after the campaign ended).