To begin, click on the APPLE, then on CONTROL PANELS, and then on TCP/IP. You want the "Connect via:" to be either PPP or FreePPP depending on which you use. Under "Configure" set that to "Using PPP server".

Under the "Name Server Addr" section, enter the IP address of the DNS SERVERS that your ISP gave you. (There should be two of them.)
Under search domains, you can leave this blank. Click on the square in the upper left corner, and that's it.
Click here to return to the Mac. menu