They are 4 options on the 'Manage my account' settings
Changing your password requires you to enter your new password twice to avoid typos. It prevents from causing trouble accessing your account in the future
You can log in to India forums by using one of your existing accounts from
It is a method of confirming users' claimed account by scanning QR Code or entering a key into your two factor Authenticator app like Microsoft Authenticator for Windows Phone, Android and iOS or Google Authenticator for Android and iOS.
Once you have scanned the QR code or input the key, your two factor authentication app will provide you with a unique code. You can also reset your authentication key however If you do not complete your authenticator app configuration, you may lose access to your account.