Custom Field Identifiers can be edited from your account. When a Custom Field Identifier is edited, it's updated for any person that has the Custom Field set. Updating a Custom Field Identifier does not affect the Value of the Custom Field.
To edit a Custom Field:
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Click People
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Click Custom Fields
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Locate the field to edit
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To the far right of the field name, click Edit
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Update the Field Identifier
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Click Submit