How to change the WordPress application domain?
In order to change the domain that your website would work with you should open your WordPress administrative area -> Settings -> General.
Under the WordPress address (URL) and the Site address (URL) fields enter the domain that you wish your application to work with and save the changes.
In this way your website will work with the newly specified domain name.
The same modification is valid if you want to add "www" to your domain.
If you want a lightning-fast WordPress website, check out our free eBook WordPress Speed Optimization Ebook! In it you will find a variety of easy-to-follow tips to improve the speed of your site!