How do I change my diary to the percentages that I want

I want to change my diary to 40% carbs, 40% protein, and 20% fat. When I go to the "settings" tab and click diary it only gives me the option to add or delete what I want viewable in my diary. Is there a way I can make sure i get the cetain percentages that I want for my dietary needs? Please help if you know the answer. Thanks!