Hi @Norman you can delete/edit custom fields from the card back. Please open the card and click the "Custom Fields" button on the right-hand side. Then, select the Custom Field you'd like to edit. A pop-up window will appear, and you'll be able to edit the Fields or click on the "Delete Field" link at the bottom.
Here is a link with additional information:
If you no longer want the custom field power-up you can disable it under the power-ups section.
Please let me know if that helps.
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