It is a pretty easy connection - just connect the right and left RCA "tape outputs" to the computer audio input. I'm not sure what you are using for a computer audio interface, but just connect the "tape outputs" to the line inputs on your interface or I/O.
On stereo sources into the analog board, turn the individual input channel pan control all the way left for the left input and all the way right for the right.
On stereo sources into the analog board, turn the individual input channel pan control all the way left for the left input and all the way right for the right.