How do I change the subject line of the envelope before I send it in the Listing Documents section?

After clicking Prepare Envelope you will be presented with an option to add additional envelope recipients and this same step will allow you to update the email subject and message body for the recipients.

If, instead, you choose to Edit in DocuSign and open the DocuSign window, scroll down to the “Add message” section. There, you may edit the subject and the email message for each of your recipients.