What should I do about my thermostat?

I have no system what I should do about my thermostat, and right now, I cannot figure out how to use my current thermostat.

My children thought that it would be nice to finally buy me a current thermostat.

I have been using an seasoned thermostat for a long time, and it was time to upgrade the thermostat. The thermostat wasn’t working officially anymore. I figured that I would just buy the same kind of thermostat, but my kids were insistent that I should get a newer thermostat. They said that the newer thermostats had a lot more features and would work a lot better than my seasoned thermostat. Initially, I was nervous. I have been using the same kind of thermostat for a long time, and I was afraid that I would not be able to figure out how to use my current thermostat. However, my children promised that they would show me how to use my current thermostat, so I hesitantly decided to let them get me the thermostat. They even paid the Heating, Ventilation, and A/C worker to install the thermostat. While my children were there, they showed me how to use the current thermostat, and I had it working officially. However, after they left, I totally forgot how to use the thermostat. I am undoubtedly forgetful, and I was sad about it. I called my son, and he came by to show me how to use the thermostat again. I have forgotten how to use my thermostat numerous times so far, and now, I am stuck. I have asked my kids numerous times, but it seems that I am not going to be able to retain the information. What am I supposed to do? They already bought and installed the thermostat. I can’t just buy a current one!
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