Change domain name (wordpress)
Below are the simplified instructions taken from Moving an Existing Installation to a New Server or Location, but specific to answer your question.


Open the file wp-content/plugins/civicrm/civicrm.settings.php in any text editor and change the value for CIVICRM_UF_BASEURL with your new domain name
For CiviCRM Version 4.7 open the file wp-content/uploads/civicrm/civicrm.settings.php
Login into WP and navigate to 


http://[your domain name]/wp-admin/admin.php?page=CiviCRM&amp;q=civicrm/admin/setting/updateConfigBackend&amp;reset=1

and clear cache and save the new base directory/path settings


Rebuild CiviCRM menu by navigating to 


http://[your domain name]/wp-admin/admin.php?page=CiviCRM&amp;q=civicrm/menu/rebuild&amp;reset=1