My iCloud account Information

That still doesn't make much sense as asked. Do you mean your data files? Your password? How much space it is using? What photos you have in it? Your home mailing address? What contacts you have in it? Your reminders? Your calendars? Storage subscriptions? etc.

Click on this link to read what to do "If you forgot your Apple ID" --> https://support.apple.com/HT201354

Click on this link to read what to do "If you forgot your Apple ID password" --> https://support.apple.com/HT201487

or go directly to this link --> http://iforgot.apple.com/

Also read about "What to do after [or before] you change your Apple ID email address or password" - https://support.apple.com/HT204071

If you still need help:

Contact Apple for help with Apple ID account security "This article provides country-specific Apple Support contact information for customers seeking help with their Apple ID password or other security-related issues."

https://support.apple.com/HT204169

You can find iCloud information see the article Change your Apple ID account information on Mac - Apple Support

It's not necessary to change the information , but data regarding iCloud account can be viewed .

Your Apple ID is normally your current or an older your email address. You don't really have a user name except in a few places such as this forum. I am only known by my user name on this forum. When you log into iCloud you log in with your email address and a password.

Which iCloud.com features are available in the browser on your device - Apple Support

What do you mean by "information"?