You need to be a registered Apple developer. I'm not sure if you can just use GS and test in the program (not on the device) without paying Apple the $99 but it's possible...
To publish your application, you need to both join the apple iPhone developer program $99 as well as game salad express member program $99. So $200ish yearly including tax. You will be able to publish as many apps as you want in 1 year. You will need Xcode and iPhone simulator to run game salad viewer on your computer and install game salad viewer to test your app on your device.
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You will need Xcode and iPhone simulator to run game salad viewer on your computer and install game salad viewer to test your app on your device.
Hope that help.