If there is no way to do this in the current iteration of the Kasa system/application, I would like to request that there should be an easy way to change the SSID of an existing/configured Kasa device to another SSID.  Thank you.

Well, I just found out that if I remove the device and re-add it, I don't have to factory-reset it because I can re-add immediately after I remove it. Then I can join it to a different SSID. But of course, I will lose all the programmed schedules, room assignment, etc. because it was removed. This is kind of stupid on how to join an existing device to a different SSID.

Also, I found out that when I re-add it, that's when it knows that the firmware needs to be updated.  There should be an option to check for firmware update and asked to update it!