Confused about the math of this. Please help!

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I'm having trouble making sense of the math...I want to lose 1 pound a week and exercise 90 minutes a week (they say I should burn 660 cals in that 90 minutes). They have given me the allowance of 1,640 cals a day base on these goals. My confusion is that if I dont exercise one week am I still allowed those 1,640 calories per day? Or do I need to subtract those 660 fitness calories out of the week somewhere? Because arent we allowed to "eat " those calories if we burn them anyway (they have the saying "exercise more, eat more)?

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