How to sign out of an iCloud account on an iPhone and into another one?

I got an iPad for xmas and my parents made an iCloud account for me that I'm signed into on my iPad but I'm still on my mums one on my iPhone. How do I change that? I have a iPhone 4 BTW. My mums old phone.

Go to icloud.com
sign in with your apple id and at the top right click your id under dropdown menu account settings>Advance >sign out of all browsers.

In the device you want to remove icloud from go into Settings-iCloud, scroll down to the bottom and in red you will see 'Delete Account'. Tap on that and then enter the Apple ID's password to sign out. It will delete the icloud account from the device but the account itself s left alone. It simply removes it from the device.

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