hot to change icloud account on iphone 4s
When I go into settings - iCloud, and try to delete my account, it asks for the password for my old account which no longer exists. I also can't create a new account with my new details.
Basically, when I got my phone I created my account using my (at the time) email details. Since then I have changed my email and updated my Apple ID with iTunes and also iCloud (on the pc). However, my phone keeps coming up with a warning telling me I need to verify my password for my account, but the account email it's showing is my old one. As I can't remember the password for my old email address I tried to reset it but Apple keep telling me there is no account with my old email details, which makes sense as I've amended my account to have my new details.
My iCloud account on my phone shows my old email address but I'm unable to amend it. Please help.
Thanks in advance.
iPhone 4S, iOS 7.1.2