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I checked your form titled "Registration Form" and I was still able to check and edit the list of products you have.
Here's a quick step by step:
1. First, select the payment field and click the wizard or wand icon.
2. After clicking the next buttons, you should be able to view the product list setup like this:
To edit, simply click on the product and the product details setting will show up.
I hope that helps. Please do make sure that you are still logged in and your session have not yet expired or timed out.