You can set up the mail filters using the settings in your webmail.
Before you begin you need to set up the mail you need to forward in your WPX hosting account:
You can see how to do that from here:
Setting Up A New Email Account On WPX
After you created your email account you will receive instructions on how to access the webmail.
In this article you can see a step by step tutorial:
How To Access Your Free Webmail Account On WPX Hosting
Now after you have accessed the Webmail the next step is to create the filter.
You can do that from your Usermin that can be found in the upper left corner of your browser screen.
After you select Usermin you will need to click Mailand then select Filter and Forward Mail (1).
And now the Filter and Forward Mail screen will appear. From here you need to choose Add new email filter (2).

There you can set the email filters you want.
If you run into trouble and get stuck, please raise a support ticket here: