Step One:
First and foremost, make sure that FreePPP is installed.Once you are certain it is installed - go to Control Panel and open MacTCP.
Once the MacTCP window opens, click on the PPP Icon.
Down towards the bottom of the screen, click on the More button.

Step Two:
In the Option Address box on the top left of the window, make sure that the button that is labeled Server has a dot near it.In the Domain Name Server Information box, enter the following information:
Primary DNS: 12.40.132.135 and Secondary DNS: 12.40.132.137 - leave everything else alone.
Once you have entered in all the correct information (so that it corresponds with the picture) click the Ok button, then close the MacTCP control panel.
