How can I make the App count my daily steps in the background?

Turn On the 24/7 Step Count button in the main Menu of the App to enable daily step counting in the background.

Your iPhone’s location services must also be turned on in order for 24/7 to access the accelerometer sensor when backgrounded or screen-locked. Find location services in iPhone Settings > Privacy > Location Services.

If you reboot your iPhone (power it off and back on), re-launch 24/7 to continue monitoring your steps in the background (all Apps are shut down when you reboot your iPhone).