Managing your Address Book is useful for address printing on custom envelopes as well as white envelopes. You can either import your contacts all at once (recommended) or enter recipients one at a time while creating your card and envelope.
To set up your Address Book with your contacts, get started here.
When creating your card, under the "Addressing" step, select "Address my envelopes for me" and click "Both Addresses" if you want to print your return address as well as recipient addresses.
Ensure your correct home address is shown on your envelope. Otherwise select "Change return address."
To begin your recipient addressing, click "Select Recipients" and from your address book, choose the recipients you want to include for address printing.
To add more recipients, you can either import a file (under "Import") or manually add one recipient at a time ("Add New").
Get more help with updating your address book.