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# From Zuora UI

> Learn how to update charge definitions using the Manage Charge Definitions page in Zuora.

Learn how to update charge definitions using the Manage Charge Definitions page in Zuora.

Use the **Manage Charge Definitions** page to update a charge definition:

Navigate to **Products** > **Product Catalog**.

Find the charge that contains the target charge definition and enter the view charge or edit charge mode.

At the bottom of the **Charge Amount** section, click **Manage Charge Definitions**. The Manage Charge Definitions page opens.

In the **Charge Definition Mapping List** section, locate the charge definition and click the Edit icon on the right. The **Charge Definition** page opens.

Click **Edit** and modify the details of the charge definition.

Click **Save** to save your changes.