App Correct Balance of nutrition

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Hi. So I'm a bad fast food eater, in that I eat it lots, as it is not 2 mins away. I know this is bad, and am trying to reduce. However, given the basic allowance for MFP, It seems I can eat it 2 times a day and still be within all limits. This is why I stopped using the app in the first place. Now doing the 12wbt and want to use it again, as it is an AMAZING app.

I Know I can tweak it so that it allows me less sugar and fat (as a %) of what I eat. I want to know what values I should put into these. I have changed it to 10gms fat and 5gms sugar... I am going to presume that this is NOT the correct amount that I am to be having, BUT what is the correct allowance? Can someone please help with SPECIFIC values I can enter. Thanks heaps in advance.