Thank you for your reply!
Using your advice, I was able to figure out the RESET function! I simply had to have the remote in learn mode, select the device whose functions I wanted to clear out, and hit the reset button.
Very happy!
(I had previously tried the reset button with the remote powered off, and with the remote powered on and the device selected but in *USE* mode, but it needs to be in *LEARN* mode for the RESET to work).