How to sign out of devices to change Apple ID
Sorry, I really didn't know where to post this question.
I want to change my Apple ID since I am changing my email address. Directions on Apple site say to "sign out of every Apple service and device" before signing in to Apple ID account page. How do you sign out of a device? I don't even know what that really means. Does it mean to remove my devices from the Apple ID account page? (I can't very well remove my MacBook if I want to use it to access my Apple ID account can I?
I can sign out of iTunes and iCloud, but that's all I know. What else do I need to do?
MacBook Pro (13-inch Mid 2012), OS X El Capitan (10.11.6)