How to use this application: 1) Enter your address (Note: application runs entirely locally; no data is collected), 2) Enter your address list (text only, separate lines, with different addresses separated by a single empty line), 3) Upload your holiday photo or card image with message (8.5x11in, portrait orientation), 4) Press "Create my cards!", 5) Print double-sided and fold in thirds, 6) Place in double-window security envelopes so that address and return address show, 7) Affix postage, seal, and send! Note: This method works well with these envelopes.