It's basically "add the muxes, sit back and let the scanning commence". If you've got the right settings, it's pretty automatic.
I've never personally bothered with most of the details - set the frequency (e.g. PSBA on C53 is 730.2MHz so enter 730200 kHz), set bandwidth to 8 MHz and leave everything else as 'Auto'. Make sure your adapter is enabled, and select 'Autodetect muxes' and off you go...
On the right of the adapter config, you'll see Status:
Status
Currently tuned to:
Gloucestershire: 474,167 kHz
Services:
145
Muxes:
7
Muxes awaiting initial scan:
0
... so you can use this to check when the scan is complete, as the 'awaiting scan' will go down and the 'services' go up. When complete, click 'map DVB services to channels'.
