Смена почты Apple ID

See this Apple article: If you see No Service or Searching on your iPhone or iPad

If you see No Service or Searching on your iPhone or iPad - Apple Support

I want to change my Apple ID email address. 

See this Apple article: Change your Apple ID

Change your Apple ID - Apple Support (SG)

Then see this Apple article: What to do after you change your Apple ID or password

What to do after you change your Apple ID or password - Apple Support

Gives such an error. What should be done?

Don't understand the error on your screenshot, so see the following Apple articles:

If your Apple ID is locked or disabled

If your Apple ID is locked or disabled - Apple Support (CA)

If your payment method is declined in the App Store or iTunes Store

If your payment method is declined in the App Store or iTunes Store - Apple Support

If you see a message that says “Your account has been disabled in the App Store and iTunes”

If a message says "Your account has been disabled in the App Store and iTunes" – Apple Support (UK)

Какое сообщение об ошибке вы получаете, когда пытаетесь изменить адрес электронной почты? У вас есть другой адрес электронной почты, который вы можете использовать в качестве своего Apple ID?