This tutorial is severely outdated. The only two things you need to do is copy HudShift.ini from the discovery exe folder to data -> interface folder and modify the resolution aspect ratio in that .ini file. Something like this example:
(The original HudShift.ini file that came with Discovery install)
Remove this icon > ; < before HUDshift and save the file.
The second thing that you can do is modifying the PerfOptions. Scroll down in the .ini file when you see Display change your resolution to what you screen has, example:
Or add -dx in your Freelancer shotcut. You don't need to do that if you already have changed your PerfOptions.
This is my install directory, yours can be differed: