Full usage of Quadrum Mod 1.7.10, 1.7.2 can get a little complex. In short though, upon first running your game, a block and an item directory can be found in your config folder inside the 'Quadrum' folder. Everything to do with Quadrum happens here.

Inside those block and item folders, you will store your JSON files that dictate what blocks/items should be created (info on that below) as well as any textures that are to be used, and localization files.