Welcome to Subsim!!!!
You must download JSGME (just search it on Subsim) and then you must copy those files into the directory of your Silent Hunter (1,2,3,4,5) and then you unzip (using WinRAR or 7Zip) those files into a folder in the aforementioned directory that is called MODS just the way I have spelled it. Then you open up JSGME and on the left side there will available mods and on the right activated mods. Select on of the available mods and click on the top button that is in the middle it looks like so: >
Then your mod will be active and you can then run Silent Hunter (1,2,3,4,5) assuming you meant how to mod Silent Hunter
Your Welcome,
--- GilligansBoat