Centralite Pearl Thermostat DTH (March 2019)

I’m new to SmartThings. Just installed Pearl and paired with SmartThings Hub. Now, I can’t seem to find a way to program the schedule in the SmartThings mobile app. This is the same whether I use the default device handler, or the one posted here by OP.

Perhaps I need to install a third party SmartApp like:

By default there is nothing when I try to add from the mobile app. I had to paste the above source code in the ST cloud. Am I missing anything?