To enable your account for use with the iAd Test Server, you need to contact Apple, who can enable your Apple ID for testing. You'll only be able to do this when you're in the final stages of iAd production and have an iAd Account Manager at Apple.
1. Choose Export, then Upload to iAd Test Server. You'll need to sign in using your Apple ID. The Upload Options dialog will then appear.
2. Enter in the details of your iAd, such as the ad name and description.
3. Click Upload and your iAd will begin uploading to the test server. You won't be able to edit the ad while it uploads, but you can continue working on other iAd projects.
4. Once the upload has completed, you're able to e-mail an announcement to your team that the iAd is available on the testing server. The e-mail will have instructions which can be used to view the ad...