Follow these steps to modify an email autoresponder in cPanel:

1. Log in to your cPanel account.
For instructions on how to log in to your cPanel account, please click here.

2. Under the Email section, click Autoresponders.

3. Under Current Autoresponders, click Edit for the autoresponder you wish to modify.

4. Update the following fields to configure your autoresponder.

Interval: The number of hours you want the autoresponder to wait between responses to the same email address.
Email: Enter the email address on which you want to enable autoresponder. If you enable autoresponder on support@example.com, enter "support: in the email field. (Select the appropriate domain from the dropdown list if you have multiple domains.)
From: Enter the name that the auto-response will be from.
Subject: Enter your email subject.

Body: The content your email will be autoresponding with.

5. Configure the settings of when you want the autoresponder to start and stop.

6. Click the Modify button.

7. It will confirm that the autoresponder has been successfully modified.