metalberlioz

Hi there, I'm trying to make a custom modpack for me and my friend to play on and created a server. The modpack was made using twitch launcher and despite succesfully creating the server and uploading to here on technic it still says I need to have forge modloader, can someone help guide me on how to do this? As I can't seems to access bin area of the modpack rar file to add the forge universal binary (renamed as minecraft.jar). Thanks in advance!