When you launch Minecraft and click the mods button you should now see the JurassiCraft Mod is installed. Place the mod you have just JurassiCraft Mod downloaded (.jar file) into the Mods folder. Open the folder Application Support > look for Minecraft.
On mac open finder, hold down ALT > click Go then Library in the top menu bar. Frequently Asked Questions How do i install jurassicraft mod on minecraft?
