The "Signature" field does not appear in the list of fields on the "Manage Fields" page (/admin/config/people/accounts/fields) and cannot be re-ordered or grouped if using the Field Group module.

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Version: 7.22 » 7.x-dev

Core issues are now filed against the dev versions where changes will be made. Document the specific release you are using in your issue comment. More information about choosing a version.