Each list has a description that is shown to subscribers on the hosted subscription form page and a signup message that is shown after they start the subscription process. This article will show you how to update the contents of these messages.
First, navigate to the list you want to update.
Next, click Settings, then List Settings.
A window will appear that has a text field for the Description and a field for the Signup Message. Enter the desired text in each field, then click Save Settings.
Your list's description and signup message are now updated and will starting showing to subscribers.