why cant I change the statistics of tools/biomes

I am trying to make a cool addon, but there's something wrong. When I load up a tool and create the texture, i cannot change how good the tool is or how much strength it has. i also cannot create dimensions, armor sets, structures (it wont let me import the structures) or import JSON 3d models. every time I try to do this and click on the button, nothing happens. I also can not change the colour of a biome, mushrooms per chunk, flowers per chunk, etc. neither can I create custom trees. PLEASE HELP!!