Q: I changed my apple ID but when I open iCloud it still has my old ID and I can't log in, how do I fix this?

Hello scottyme1,

In order to sign out of your iCloud account that had a ID change, you would need to change the account back to the original. The reason for that is probably due to the Find my device feature and it needs to verify and if that iCloud account does not exist because of the name change and you cannot sign out. Changing it back is pretty easy and should not ask you to verify but once you change it and sign out, you can change it back to what you want it to be. Take a look at the article below to walk you through this. 

If you're asked for the password to your previous Apple ID when signing out of iCloud

https://support.apple.com/en-us/HT203828

Regards,

-Norm G.