[amsat-bb] ARISS packet

I read JoAnne's article in the recent AMSAT journal issue with great interest as it was somethingnive never done. I set up UISS with SoundModem to work with my Flex5000A. I have no decoding packets whatsoever either from ARISS or terrestrial on 144.390. But I've not gotten any feedback to suggest I'm being heard. I've tried 144.390 but do not see my location coming up on any APRS map. Any idea what I'm doing wrong? I can verify that I am transmitting a packet signal. I used packet for a short time years ago with a hardware TNC but quickly lost interest and never got into APRS. advice would be appreciated.

73 Rick, W2JAZ