Warning: include(./whatsapp/whatsappblock.php): Failed to open stream: No such file or directory in /gopanel/sites/mailingliststudio.com/_live-chat.php on line 2

Warning: include(): Failed opening './whatsapp/whatsappblock.php' for inclusion (include_path='.:/usr/share/php') in /gopanel/sites/mailingliststudio.com/_live-chat.php on line 2

Is there help on setting up Accounts for subscriptions/remove?

Yes. In the setting form Accounts registration / cancellation there is a wizard button that will automatically set the most used POP3 server parameters. Also on the site there are guides for the standard settings of these POP3 servers.

Mailing List Studio https://mailingliststudio.com