If you want to change the main root FTP Account, then you need to change the password of your cPanel Account. However, if you want to change the password of a particular FTP Account, you should follow this instruction.
- Log into your cPanel account.
- In the "Files" section, click on "FTP Accounts" Icon.
- Under the "FTP Accounts" list, click on "Change Password" or use the "Password Generator."
- Click on the "Change Password" button.
Now you can access your FTP user account with your new password.