Here is the documentation: http://www.sdrplay.com/docs/sdrplay_ext ... de_v38.pdf
I've updated the Windows page to include a link to it. It's always available through the Help panel in the ExtIO plugin.
After you enable the station name system, you need to restart HDSDR.
Then tune the LO to 1MHz and then tune the VFO freq to 1170 - as long as you don't have any filters set in the station config panel you will see at least one radio station on that frequency.
If you don't, let us know.
If you don't actually click the button in the lower left hand corner of the main page above where it says:
Version 3.8 Build 0218
no pop out window will appear.
Reason: No reason