Hello Jack, with your email address I also couldn’t find any questions in our Forum. Did you use a different email address previously or different account? Sorry about that!
Regards,
Rui

Oops, that is what happened.  I have a one email (this one) for the ESP32 class, and another for micropython.

In fact, I don not seem to have a login pw for the other email (jack-rntlab@opayq.com).  How to register this?

Which account do you want to keep? I can merge your accounts into one email address.
Please submit this form, with both your email address and let me now which one you want to keep:

• https://rntlab.com/support

Thanks!