You add command line parameters to the "fpvfreerider.exe" file.
Actually, it might be better to first create a shortcut to the exe file and then add command line parameters to that.
To create a shortcut, right-click the exe and choose "create shortcut"
Here you can find some example on how to add command line parameters to a shortcut:
https://www.lifewire.com/command-line-parameters-video-games-3399930