What should I do about my control unit?

I have no idea what I should do about my control unit… Right now, I cannot figure out how to use my modern control unit.

My children thought that it would be nice to finally buy myself and others a modern control unit.

I have been using an aged control device for a long time, & it was time to update the control unit. The control device wasn’t working regularly anymore. I figured that I would just buy the same kind of control unit, however my kids were insistent that I should get a newer control unit. They said that the newer control units had a lot more features & would labor a lot better than my aged control unit. Initially, I was nervous. I have been using the same kind of control device for a long time, & I was afraid that I would not be able to figure out how to use my modern control unit. However, my children promised that they would show myself and others how to use my modern control unit, so I hesitantly decided to let them get myself and others the control unit. They even paid the Heating & A/C serviceman to install the control unit. While my children were there, they showed myself and others how to use the modern control unit, & I had it working regularly. However, after they left, I totally forgot how to use the control unit. I am truly forgetful, & I was anxious about it. I called my son, & he came by to show myself and others how to use the control device again. I have forgotten how to use my control device six times so far, & now, I am stuck. I have asked my kids numerous times, however it seems that I am not going to be able to retain the information. What am I supposed to do? They already obtained & installed the control unit. I can’t just buy a modern 1!
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