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I'm a novice with civi. Please, where can I edit the content of this field that contains the checkboxes of the mailing lists? I need delete one, but I don't find where I can edit the field content.
It's hard for me to tell 100% for sure since I can't translate the text, but it looks like you're looking for custom fields.
Once you go in there, you should be able to find the field you're looking for.
Required, but never shown