PLEASE HELP ME with a vintage Kenwood receiver (KA-72B w/o manual).

I'm trying to help my neighbor with their stereo questions. The
final intention is to copy their collection of vintage cassette
tapes to their new CD(s) with the new Pioneer recorder that
was purchased.

The cassette tapes play fine through the Kenwood receiver
and it appears that the Pioneer recorder is working as well.

The Pioneer CD recorder is now connected to input "A" and
the cassette player is connected to input "B".

Anyone have advice on how to operate the Kenwood receiver
to enable the cassette source (input B) to record on the CD
recorder (input A) ??

GREATLY APPRECIATE assistance in the operation of this
hardware to enable this dubbing operation to proceed.

With harmony.

JAL