[MVMA] Signalink - fldigi - PTT question

[Chuck Gelm]

I'm gonna ask hear first, then once I find out who the local HF/VHF/UHF 
gurus are
I'll use them later.

I am unsure about the Signalink PTT configuration in 'fldigi' v4.0.1.
I am not seeing any USB device in
'Configure' -> 'Rig control' ->  'Hardware PTT'
?
I do see USB devices in
'Configure' -> 'Sound card' -> 'Audio' -> 'devices'
for 'Capture' and 'Playback'.

How do I configure fldigi to use the Signalink for PTT?

Chuck