By default, the name Campaignzee displays for a list is taken directly from Mailchimp. If you would like to change the name of the list, you must first change the name in Mailchimp, and then sync the changes to Campaignzee.
Follow the instructions in this article to change the audience name in Mailchimp
In Campaignzee, click the Sync button in the top navigation bar to sync the changes.
That's it. Your list's new name will be displayed on the hosted signup page.