If you want to change the main root FTP Account, then you need to change the password of your SiteWorx account. However, if you are going to change the password of a specific FTP account, you should follow this instruction.
1. Log into your SiteWorx account. (e.g. www.example.com:2443/siteworx/ )
2. Under
SiteWorx Menu, click the
Hosting Features menu item if it is not already open.
3. Click the
FTP menu item and then click on the
Accounts option.
4. Under the
Action list, select the appropriate FTP Account and click on the
Edit button.
5. In the
Change Password and
Confirm Password fields, enter your new password or click on the
Generate button to generate a new password.
6. Click on the
Save button.

Now you can access your FTP user account with your new password.