If you've purchased directly from a Seller's store you'll still be able to view that subscription on your Cratejoy account. Here's how:

1.) First log in and go to Subscriptions:

2.) Next, you'll see a section called Other Subscriptions:

There you'll see any subscription you've purchased directly from a seller. Right now you can adjust the shipping address and payment method associated with that subscription by clicking Manage Subscription.

If you needed to adjust the subscription further, just click the button to Modify Plan Details:

Clicking there takes you to the Seller's store where you can further modify your subscription.