Here is how to make sure PlayFitt has permission to track your steps and stairs from your phone:
Go to your Settings App.
Scroll down until you find PlayFitt and tap on it.
Make sure "Motion & Fitness" is on. (see below)
If that is now turned on, check your Privacy Settings:
Go to the Settings app.
Select the Privacy menu.
Tap on "Motion & Fitness".
Make sure "Fitness Tracking" and "PlayFitt" are on. (see below)
Now PlayFitt is ready to track your steps and stairs. Have fun!