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This typically occurs in the iOS Simulator, which does not have a magnetometer sensor. On a physical device, you should see real EMF readings immediately.
The App uses your device's built-in magnetometer, which provides readings accurate to approximately 0.1 microtesla. For best results, calibrate your sensor by moving your device in a figure-8 pattern when prompted.
Open the Settings app on your iPhone, tap your name at the top, then tap Subscriptions. Find EMF Detector and tap Cancel Subscription.
Open EMF Detector, go to Settings, and tap "Upgrade to Pro". On the paywall screen, tap "Restore Purchases" at the bottom.
You can manage or cancel your subscription at any time through your Apple ID settings. For instructions, visit Apple's subscription management page.