Yii2 adding an extra field to the form to add to database

On an existing project where there is a table with 3 fields (ID, name, label)

  `id` int(11) NOT NULL,
  `name` varchar(32) DEFAULT NULL,
  `label` varchar(1) DEFAULT 'A'

Currently on the page where to add new record to the above table there is the form with only one field for the 'name', and works fine, and I need to add another field for the 'label' field; so I go to the related model (models/Products.php) and I have:

    public function attributeLabels()
class Products extends \yii\db\ActiveRecord
{
    /**
     * {@inheritdoc}
     */
    public static function tableName()
    {
        return 'products';
    }

    /**
     * {@inheritdoc}
     */
    public function rules()
    {
        return [
            [['name'], 'string', 'max' => 32],
            [['name'], 'unique'],
        ];
    }

    /**
     * {@inheritdoc}
     */
    public function attributeLabels()
    {
        return [
            'id' => Yii::t('app', 'ID'),
            'name' => Yii::t('app', 'Name'),
        ];
    }

I add the following to the above file, but no new input field is added to the form on the page

public function attributeLabels()
{
    return [
        'id' => Yii::t('app', 'ID'),
        'name' => Yii::t('app', 'Name'),
        'label' => Yii::t('app', 'Prefix'),
    ];
}

I also tried adding to the rules like this, but no joy

public function rules()
{
    return [
        [['name', 'label'], 'string', 'max' => 32],
        [['name', 'label'], 'unique'],
    ];
}

Appreciate if you can point me to what I am missing.

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