Enabling AutoFill
If you shop online, AutoFill can make entering information such as Ship To addresses much easier. Safari gets this information from your Address Book card, and will automatically fill in any relevant information into webpage fields.
To enable Safari to AutoFill using your Address Book information, choose Safari > Preferences, click the AutoFill button, and select the "Using info from my Address Book card" checkbox. To make sure that your card is up to date, click the Edit button to open Address Book.