Hi @Joan Rasanen,
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.
Clicking on a custom field in the does not bring up a pop-up. As far as I can tell, you're stuck with custom fields after they've been defined.
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