Apps linked to MFP

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Im new to some of this and really cant figure it out. I have My flex bad app linked to MFP and I have my Runkeeper linked to MFP. I just went running and used my app Runkeeper while still wearing my arm band but nothing is recorded in my exercise, what did I do wrong? How do I log my running into exercise and am I suppose to take off my band when I run? My band isn't keeping calories burned either in exercise.

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