In order to change the password to your email account you would need to login to your control panel.
Once you are logged in, hold the mouse over “Mail” and select the “Accounts” option.
You should see a list of email accounts that were created. Select the one that you wish to make changes to.
Enter the new password you wish to use and confirm the password below it. Please ensure that the password doesn't exceed 15 characters because the server would only use the first 15 letters to change the password with. Ensure that you tick the “Change Password” box before selecting the “Save” option at the bottom of the page.
You are now ready to login using your new password.