Two things I didn’t more specifically mention:
The file may have permissions needed to edit it. You may have to issue a sudo command when opening the file. Some text editors are different. Sudo will bring in administrator permissions.
The command in terminal will look something like sudo gedit /etc/auto-cpufreq.conf
If the text editor can increase permissions (or no permissions are required) then nothing about this task requires the terminal. Just open the file make your changes save it and you’re done.
I'm not sure how to open the text file.
I did figure out how to install TLPUI and that seems like what I was expecting this to be with user configurable parameters all within an easy to use GUI. Still determined to figure out the auto-cpufreq configure file though with your help. Thanks.