To install the mod you should be able to drop it in the instMods folder in the Mindcrack folder inside where ever your feed the beast installs go.
Also I would recommend people use Optifine, which you can dump in there as well. Optifine will improve performance a great deal
Optifine Downloads can be found here:
http://optifine.net/downloads.php and if you have a grunty computer I recommend the HD Ultra otherwise try the HD Standard or the Light