# Enable product metafields
The **Smart Product Filter & Search** app allows you to filter and sort products using **Product** and **Variant** metafields.
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### 🔧 How to declare a metafield in our app settings
1. Open the **Smart Product Filter & Search** app from your Shopify admin.
2. Go to the **Settings** section.
3. Select the **Metafields** tab.
4. Click the **Add Metafield** button.
5. In the popup window, choose a metafield resource: **Product** or **Variant**.
6. Enter the **Namespace** and **Key** of the metafield you want to use.
7. Under **Applies to**:
* Check **Filter & Search** to use the metafield as a filter.
* Check **Sort** to use it for sorting.
8. Click **Save** to finish.
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### ❓ How to find the Namespace and Key of a metafield
1. In your Shopify admin, go to **Settings** and open **Metafields**.
2. Select either **Products** or **Variants**.
3. Click on the metafield you want to use.
4. You'll see the **Namespace** and **Key** displayed in the metafield details.
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### ⚠️ Can’t See Your Metafield Data?
If your metafield data doesn’t show up, you may need to create a definition:
1. Go to **Settings > Metafields** in your Shopify admin.
2. Choose **Products** or **Variants**.
3. Click on the **Metafields without a definition** tab.
4. Click **Add definition** and follow the steps to define it.
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💬 **Need Help?** Contact us at **** – we’re happy to assist! 😊
