If you are interested to appear your website / site under a custom domain URL that you control, such as www.yourdomain.com (for example www.hidemytips.com) or subDomainName.yourdomain.com (for example: joomla.hidemytips.com) you can have your site appear at that URL by going through a process known as mapping your site. After doing this, people navigate your site, they will remain on www.yourdomain.com (for example www.hidemytips.com) or subDomainName.yourdomain.com (for example: joomla.hidemytips.com) unless they click an external link. For doing this, you need have to work just few steps. This page will provide you all the information to do mapping your site to your own URL or your custom URL.
HideMyTips always interested of real tutorial. The tutorial which is discussed (with snapshot) in this page is created during the time when joomla.hidemytips.com is created.
To point visitors to this new URL, you might also have to make changes to your CNAME record, which controls what aliases are associated with your domain.