How to change my iCloud account?

Hello,

If you reuse passwords, I recommend starting with changing your Apple ID password Change your Apple ID password - Apple Support. This is a step in the below article but starting here can prevent a third-party account compromise from adding risk to your Apple ID security.

This is an often confusing relationship for users but you would actually want to take a look at your Apple ID, which iCloud is a feature of, and make sure it has not been compromised.

If you think your Apple ID has been compromised - Apple Support

If your want to change your iCloud email address you would need to change your Apple ID. The iCloud email is just (Your Apple ID)@icloud.com.

Change your Apple ID - Apple Support

I hope this helps.

Hi, to change your iCloud password, on your iPhone go to Settings, “Your Name” , Password and Security, Tap Change Password. You will need to enter your old password then enter a new password, tap change password. Facebook and Messenger are not Apple products but you may need to research how you change the passwords on both these apps with the relevant developer. I have added Apples support page for reference Change your Apple ID password – Apple Support (UK)

If you feel an unauthorized person/app is remotely using, controlling or monitoring your device, then that is possible only if you have done one or more of the following Don'ts...

1. Don't hand over an iPhone to kids or to a stranger without Enabling Guided Access
2. Don't share Apple IDs
3. Don't Jailbreak
4. Don't share sensitive information pertaining to your device
5. Don't give in to Phishing
6. Don't plug in your device in Airports and Public places through third-party cables and trust the device. Beware of Juice Jacking. (Especially in India)
7. Don't leave your iPhone unlocked and unattended in public places like offices, schools, malls, etc.

If one of the above is true then quickly change the Apple ID Password and Return iPhone settings to their defaults.

Keep the iPhone updated to the latest iOS always and never Jailbreak. That's it.

iOS / iPadOS devices cannot be hacked or infected with Virus / Malware / Spyware unless you have intentionally downloaded spurious software or unauthorized apps directly from the internet and installed them on your device or/and have Jailbroken. 

It (Hacking) also depends on how careful you are in sharing sensitive and valuable information pertaining to your iPhone such as Passcode, Password, etc with your friends and family members.

Be judicious when sharing the device's sensitive and valuable information with friends and family members.

If you don't reckon what is said above is true then you have two options...

1. Report the hacking incident that you are facing to the local law enforcement authorities and follow it up
2. Believe it, it can't be hacked. There are people who still believe that the earth is flat and also some believe no one has ever landed on the moon. What can anyone do about that? This is a free world you can believe in anything, the choice is yours.

In the Sign-In and Security section, choose Apple ID. Enter the email address that you want to use as your Apple ID. Choose Change Apple ID. If ...

Change your Apple ID

Facebook is not an Apple product. Contact the app developer here --> App Support or Facebook Help Center | Facebook

Messenger is not an Apple product. Contact the app developer here --> App Support or Messenger Help Center | Facebook

Another way of detaching apps from Apple ID is given below