First Part:

Note: The BOLD writing is what you will need to replace

With the:
**
* Domain name.
*/
public static $URL_DOMAIN = "example.com";

make sure that you put a .com at the end and make sure that you don't enter a registered domain name or else you will NOT be able to access that site!

<?php
/**
* Global configuration properties. Please adjust this file to your needs.
*
*/
class GlobalProperties {

/**
* Name of your service, e.g. "MIT University Wikis".
*/
public static $SERVICE_NAME = "Wikidot custom installation";

**
* Domain name.
*/
public static $URL_DOMAIN = "example.com";

/**
* URL of documentation site.
*/
public static $URL_DOCS = "http://www.wikidot.org/doc";

/**
* Support e-mail address.
*/
public static $SUPPORT_EMAIL = "support@example.com";