Below you can find instructions on how to make contact or newsletter forms work.
php/contact.php and specify recipient's e-mail address by filling $fromEmail and $sendToEmail options. These email addresses will receive all form inquires/messages.
The example below shows how to change contact form fields as well as success and error messages.
After creating your own custom newsletter form through Mailchimp. Replacing the newsletter form action with the one in your generated newsletter code should be enough to personalize the existing subscription forms in STULO.