T
They give you recipes. That is explained in game when you find your first tablet (or what are they called... Metalize or something like that).
R
I think you code scan it so that you will know the recipe in order to make the weapon specified by it.
M
After that you can make new Item by using the specific ingredients.
And you can make a modification to make it better. :)
D
ok ty i made heroes hat,excalibur,marumase,aegis lol