Theres no need to apologize.. let me try some visual Aids, and we can work through this one step at a time..
I tried to explain the directions a little better and in more depth below.. Please try to run through step by step, and if you get stuck at any point, please let me know where.
The finderbox im discussing is here
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Its the little magnifying glass at the top right of your screen. You may have to minimize firefox or safari to see it.
Once you see it , left click the magnifying glass, and you will see the text bar where you can type.
Type in terminal, then a list of results should show up..
On that list of results, we want to left click what is called the Terminal ( application )
The terminal application is just a small screen, with text on it where we can type commands.
Then, we cant to copy and paste these commands into the terminal.
defaults write com.apple.Preview PVImagePrintingScaleMode 0
defaults write com.apple.Preview PVImagePrintingAutoRotate 0
( to copy and paste, you want to use your mouse, drag a box over the two lines above to highlight then)
Then, right click on the highlighted text , left click on copy
Then, go to the terminal screen, left click where you can type, then right click, and then click paste..
You should now see those commands inside the terminal box.. Now hit enter..
That will run the command.
Now its just time to close mail and open it.. And then open an email message, and the click file, print preview.. And see if it looks right..
If my answer helped, please click one of the smiley faces to rate the solution, and then click the green accept button to accept the answer..
If my answer did not work, please wait to rate the answer and also wait to accept and instead send me a reply so that I can continue to assist you as needed.