Possible solutions of your questions

Hello.
To change the password in cPanel, You need to authorize it and through the Change password. To change the password of the billing system, use the Profile.
Please set complex passwords with numbers and upper case letters.
Hello.
To change the password in cPanel, You need to authorize it and through the Change password. To change the password of the billing system, use the Profile.
Please set complex passwords with numbers and upper case letters.

notify of new email

email changed.

ok

no, ftp explained ,  is the password of the account. it is common to the input of the ftp and login to cpanel.

ok