Dl-fldigi 3.11.4-r85 (Old Version)
Once you've filled in the rest of the details go to the DL Client tab of the preferences window, here you can select which payload you are tracking. Depending on the version you are using (Version 2.0+), you may need to click the “Autoconfigure” button.
When this is selected it'll automatically setup your fldigi to decode the payloads signal!
Now connect the radio with your cable to audio in, you should start to see the signal appear on the bottom waterfall of dl-fldigi. It should be 2 yellow lines on a blue background, click on the right line and this will place the 'decoding lines' over the top of the signal (these are displayed as red). Now dl-fldigi should start to decode the data.
Data will appear above the waterfall window, similar to:
|Mission name||Sequential number||Time||Latitude||Longitude||Altitude||Other