getting the domain to move

I am trying to change domains from testdomain.screnews.com to screnews.com and somewhere in the wordpress files it is not letting me log into the screnews.com once i have deleted the testdomain. I created the page using testdomain, but now that the original site was moved over would like to take the testdomain offline and only use screnews.com.

I am wondering which files need to be altered so this can happen.

Thanks in advance for any help that may be given.