LA Kickboxing - how many calories should I consume?

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I am new to MyFitnessPal and I have to admit I am a bit confused. I am a female 51 years old and started LA Boxing. LA Boxing is not listed as an excercise in the database so I use kickboxing (turbo) as my excercise entry in my log. I go to LA boxing 4 times a week and I have never sweated as much in my life. I am drenched. I am calculating that Iburn 820 calories for the 60 minutes I am there 4 times a week. I want to lose 1.5 lbs a week and so MyFitnessPal suggests I eat 1200 calories without working out and 2022 when I do workout. Is this correct? I don't want to eat too many calories. Remember I work out 4 times a week. Thank you for your help