Go to "Settings" screen on your iPhone and select HCl Acid Settings (1)

1. Set the HCl Acid restrictions and accessability here. "Background App Refresh" will be visible if "iCloud" option below is ON.
2. User can select the prefered units here.
3. Turning "iCloud" ON allows syncing data to the user's icloud account to make it available to other devices.
4. HCl Acid Version