If for some reason you wish to change a password on an email account here is how you do so.
Log into your hosting control panel
In the search box type “Email” to filter the big list of functions then click “Email Accounts” You will now see a list of all your current email accounts.
Find the email address you wish to change the password for next to it there will be a link called “change password” Click that link
Enter the new password and click “change”
The password for that email account has now been changed