You've given us close to 0 information about your system, how do you expect meaningful help?
The commands you were provided are meant to be entered in the shell (A SSH session with a proper terminal would be better, but I assume you do not have set that up). On the left side in your truenas GUI click on System settings and then shell. There you can enter the commands.
When trying to copy the output, pay attention to this message
Context menu copy and paste operations are disabled in the Shell. Copy and paste shortcuts for Mac are Command+c and Command+v. For most operating systems, use Ctrl+Insert to copy and Shift+Insert to paste.
Well posting your hardware setup, as per forum rules, is a good start
Post 5 aside, you should be able to list what hardware you use. Mainboard, CPU, etc.