= WITH FORGE =
1) Install ModLoader -> http://www.minecraftforum.net/topic/75440-v100-/
2) Install Forge -> http://www.minecraftforum.net/topic/514000-/
3) Drag everything located in "Mod Files/Forge" into your minecraft.jar

= WITHOUT FORGE =
1) Install ModLoader -> http://www.minecraftforum.net/topic/75440-v100-/
2) Drag everything located in "Mod Files/Non-Forge" into your minecraft.jar