Ok, The folder is located on your normal hard drive usually C:
So by default the game installs to C:\Ubisoft\Silent Hunter 5
Now as your JSGME all you need to do is extract the NewUIs_TDC_1_0_0_ByTheDarkWraith folder from TheDarkWraiths Mod and Place into the MODS folder at C:\Ubisoft\Silent Hunter 5\Mods
Now go back into TheDarkwraits UI mod and extract the data folder from the choice of 3 dial types you want and copy this to C:\Ubisoft\Silent Hunter 5\Mods\data.
This should get you up and running.