ICloud is not recognizing the new Apple id
I changed network providers so I have a new email. I changed my Apple ID to that new email with a new password. ICloud is still bringing up old email as Apple ID and won't let me access. Error message is "this MAC cannot connect to ICloud because of a problem with ..........sbcglobal.net" (old email) "Open ICloud preferences to fix." I do that and then it sayd enter password for Apple ID which is showing my old one.
iMac (21.5-inch Mid 2011), OS X Yosemite (10.10.3)