To export your address book, sign into your account and drag the mouse to your name in the upper-righthand corner of the screen. Then, click Contacts from the drop-down menu (or follow this link
) and Look for "Export" at the top of the page.
Once you click that button, your browser will automatically download a CSV file with all your Contacts. This will not remove any contact information from your Contacts, it will simply copy your contacts into a spreadsheet.
Note: The option to export your Contacts does require a Premium membership or above.