Apple makes it easy to do right from your iPhone, iPad, and even your Mac.
You can use an icloud address, but remember that if you do, you will not be able to change it; this is from the document linked to below: If your email address ends with icloud.
How to reset your password if you have two-factor authentication enabled If you do have two-factor authentication turned on, you'll need one of the devices associated with your account nearby.
If not tap on Settings icon on the Home Screen.