Ever stumbled upon the mysterious AppData folder when poking around your computer files or trying to make a Minecraft mod ...

Next, open the Run dialogue box by pressing the Windows+R shortcut key, type %appdata% in the search field, and click "OK." ...

Once you've found one that's appealing, save the file to your newly-created Forge mods folder. The address on your PC will be: C:\Users\[your username]\AppData\Roaming\.minecraft\mods On a Mac ...