The quality grids allow to modify in details some informations. Indeed, quality grids must be suited following the context, and the calculation's formula should be defined.
On the horizontal menu, go to "administration" > "quality grids" , then select the quality grid you want to modify. You have the list of the six factors of your application. All the options you have to alter the quality grids will be explained further.
Now let's see how to set your Preferences