# Edit a log-group-level transformer
<a name="CloudWatch-Logs-Transformation-Edit"></a>

Use these steps to edit an existing log transformer.

**To edit a log transformer**

1. Open the CloudWatch console at [https://console.aws.amazon.com/cloudwatch/](https://console.aws.amazon.com/cloudwatch/).

1. In the navigation pane, choose **Logs**, **Log groups**.

1. Choose the log group that has the transformer that you want to edit.

1. Choose the **Transformations** tab. You might have to scroll the tab list to the right to see it.

1. Choose **Manage transformer**.

1. In the **Parsers** and **Processors** sections, make your changes. 

1. To add another processor, choose **\$1 Add Processor**. Then select the processor that you want in the **Processor** box, and fill in the configuration parameters. 

   Remember that processors operate on the log events in the order that you add them to the transformer.

1. (Optional) At any time, you can test the transformer that you have built so far on a sample log event. To do so, do the following:

   1. In the **Transformation Preview** section, either choose **Load Sample Log** to load a sample log event from the log group that this transformer is for, or paste a log event into the text box.

     Choose **Test Transformation**. The transformed version of the log appears 

1. When you are finished adding processors and satisfied with the tests on sample logs, choose **Save**.