Move the .zip you downloaded to your .minecraft/mods folder.
– On windows: Start then type %appdata% and press enter.
– On Mac: press command+shift+G on the finder and type ~/Library/Application Support/ in the “Go to Folder” menu that appears
The config files are found in minecraft/config. For FTB packs, I need to fix a bug where the config appears in a config folder in the same location as your FTB_Launcher.exe. Not tested with other launchers/mod packs