Show - This button displays a dialog box with the real address of the currently highlighted name in the Address Book List. In this dialog box, you can add another address (if you want to send to many users under one alias), and you can delete addresses. To delete an address, you must highlight the address you want deleted, click on Delete, and click the OK button on the pop up window. When you are finished, click on the Done button.
Add - This button calls up a dialog box that allows you to enter a real address and the name you want it to appear as in the address book.
Delete - This button will remove the currently highlighted name from the address list (after you have verified that you really want to delete it).
Rename - This button allows you to rename an existing alias (not including the address).