You will have to go through a few steps to sync your MyFitnessPall account to your gym account. Currently, you will need to login to the PK website to do this and we will eventually add this to the app for you to access.
After signing into your account from the PK website, go to:
>> Macro Log
>> My Fitness Pal Settings
>> Click Yes under Enable myfitnesspal.com food diary
>> Click Check Your Settings on MFP
>> Log in to MyFitnessPal (note it will take you directly to Food Diary Settings)
>> Enable protein, carbs, fat and fiber for "Nutrients Tracked."
>> Enter MyFitnesspal.com Username
>> Click Save