Following instructions cover the steps involved with changing the password in your Web Hosting powered by Plesk. If you need to change the password for a Professional or Classic Hosting email please read How do I change my email password? - Professional Email and Classic Hosting
Login to your Rebel account and click Hosting Manager.
Click the green button that reads Control Panel. This will open the Plesk Hosting OS in a new tab.
Go to Mail.
Click on email account you would like to change password for.
Specify a password consisting of fine or more Latin characters. Make sure to include a mix of upper and lowercase letters, numbers, and symbols to create a strong password.