You can add a new email address to your Test Address book in a variety of ways.
You can import addresses directly or add addresses one at a time in the same manner as any other address book.
You can also add new addresses during the test send process.
If your campaign is open, click Step 3 within the Campaign Creator.
If you've closed your campaign then click on Test Send either from the Campaigns screen or from the Review your Campaign Summary screen.
The Test Send window is displayed.
Click on the link to Add another test email address.
Complete the new contact details and click on SAVE when ready. Your Test Send window will be updated with the new contact.