iMac
Firstly Locate your Internet Setup Assistant.
Usually under your Hard Disk Icon.
You will see the following window:
Click Yes

Click Yes in the next window

Click the right arrow.

Type Spitfire in the blank.
Make sure Modem is dotted.
Click the right arrow.

Click the right arrow.

Put the local spitfire phone number in the first blank. (please do not put the area code).
Put your username with @spitfire.net after in the second blank. (as shown below).
Put your Password in the third blank.
Click the right arrow.

Make sure No is dotted.
Click the right arrow.

Make sure No is dotted.
Click the right arrow.

Leave this page blank.
Click the right arrow.

Put your Username with @spitfire.net after in the first blank. (as shown below)
Put your Password in the second blank.
Click the right arrow.

Put your Username in the first blank. (Do Not put @spitfire.net in this blank)
Put mail.spitfire.net in the second blank.
Click the right arrow.

Put msnews.microsoft.com in the blank. (Or any other newsgroup to which you are subscribed)
Click the right arrow.

Make sure No is dotted.
Click the right arrow.

Make sure Connect when Finished is checked.
Click Go Ahead.

That's all you need. Your Internet Connection with Spitfire is Set Up.