Hello,
To receive Emails, you just need to change the above mentioned details. But sometimes according to your Server Configurations, the PHP mail() might be blocked by your Hosts. In this case you will need to use SMTP, instructions for which have already been mentioned in the Documentation > Forms Section. The include/form.php File should always return a JSON String for the Form Processor to show the Success/Error Notification correctly. In case nothing displays, simply add the .customjs Class to the .form-widget DIV and try submitting the Form. The PHP will display error (if any) so that you can troubleshoot further.
Additionally, it is recommended to Search the Support Forums for related solutions and articles.
Hope this Helps!
Let us know if we can help you with anything else or if you find any further issues.