Log into Apple account

How do I sign out of the old account? I don't see anyplace to bring up that account. I changed ISPs and went to new account, but old account keeps popping up. What generates at username@comcast.net? Then logged on on username@centurylink.net, and could see my account settings. Once I opened App Store, pop up asked for login under the Comcast.net account. Cannot seem to get rid of Comcast account so it will use my century link account.

So just signing in as the new me won't let me edit my account? I looked at it once it forced me to change my password, as I evidently could answer the history questions properly, and it only shows the centurylink account. And going to link you provided shows a long list of things I have no recollection of signing into. How to I know I cleared everything? I really need to visit each app to make sure I change them too?

Have a feeling my Apple Experience will soon end. Can't seem to log in two days running without an error message, new password, which I just changed this am, and now won't accept because it used a user name I changed three weeks ago and not the new one I just had to create.

So far my posts to questions about Apple have not been very favorable. Know now why large business used that other guy......

Now, even though I only marked sent me comment on my post, I get 12 messages very few minutes on everybody's else's comments! How to I shut them off absent removing power from this device or shutting down my email account?

I can't tell info I want from the clutter in Italian, questions about printers, and everything else.

still have 90 plus to delete and every time i open mail get more. Did select stop email notifications, but only thing I had selected was for my post but getting posts about printers, software update, etc. Will take IPad back to store after this trip, and if they can't fix it they can donate it our greatest threat group!