Go to Settings -> General and Change WordPress Address URL and Site Address URL. Replace old url to new domain url.
By Anirudh Babbar
A website developer, loves #wordpress #drupal #php. Love posting about wordpress, php, bootstrap and SEO. Also provide online/offline training on wordpress, drupal, php and SEO. I am available on Twitter @ anibabbar , Skype @anibabbar , gmail @anibabbar !! facebook @thinkncode.com