Jim,
Don't panic or give up - you are bringing back my not so good memories of when I tried to get digital modes to work on my radio and computer - thank goodness I had an Elmer that got on the phone with me, and talked me through the set-up. It can be very frustrating! Once you get the set-up right, all the digital modes should work, including PSK31, JT-65, RTTY, FT-8. etc. etc., so PLEASE DON'T GIVE UP! If what I tell you doesn't work, send me an email with a contact phone number (my email address is on QRZ.com for K4VBM) and I will be happy to call you and help you troubleshoot to get it working to pay it forward for my Elmer helping me. PLEASE KEEP READING.
I have both a Signalink USB and a Rigblaster Pro.
For the Signalink to work, you need the correct Signalink cable that plugs into the back of your radio (I will assume that you have it, and it is plugged into the correct port on the back of your radio and into the RJ-45 jack on the Signalink).
The Signalink also needs to be plugged into a USB port on your computer using the supplied USB cable, and the driver for the Signalink must be installed on your computer for it to work properly.
The Signalink contains a USB sound card that will be a new sound device in your computer's Device Manager once the driver has been installed. This USB sound card will handle the Receive (RX) audio from your radio and deliver it to the software to be decoded, and send the transmit (TX) audio consisting of encoded tones from the software to your radio.
You also need to choose the correct audio devices in the software for RX and TX, which was mentioned by another poster, and the software should see the audio from your radio. Here is a screen capture of the configuration dialog window:
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The 'Audio input device - Receive' should be the device named 'Microphone (USB Audio CODEC ) which corresponds to the Signalink audio input device that captures the received audio signal from your radio.
The 'Audio output device - Transmit' should be the device named 'Speakers (USB Audio CODEC ) which corresponds to the Signalink audio output device that sends the digital tones to your radio.
All software programs that you use for digital modes MUST BE CONFIGURED TO USE THOSE DEVICES when you use the Signalink and all should work fine.
The software must also be able to put your radio in transmit mode, and turn off trasmit mode. That is usually accomplished via a CAT control cable from your computer to your radio which is completely separate from the Signalink.
Hope this helps you get going.
Bob K4VBM