How much protein should I eat? (252 pounds)

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I "think" I have a lean body mass of 170 pounds, and have learned that heavier people commonly have higher lean body masses, which makes sense because when I was 220 pounds I was fit but my lean body mass was 145. I want to retain my lean body mass obviously as I lose weight and I want mostly what I'm burning to my fat and not my muscles. I don't work out, but I do about 45 minutes of light to moderate cardio a day. I eat 1880 calories and my mfp guidelines is to eat 75g protein. Estimates I've read online though for my weight range from 90g to 170g a day. I'm completely confused but my all accounts mfp seems to have the lowest estimate which makes me uncomfortable. Any thoughts?

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