Search for "NFC" in your Android phone's settings. If your phone is compatible, you'll find the option. (Skip this step for iOS users)

Turn on the NFC option in your phone's settings. You can leave NFC on all the time, as it doesn't significantly affect your battery life.

Locate the NFC sensor on your phone. Hold the bottom end of the bookmark where you see the "Tap here" design and swipe it through the phone's back. (For iOS users, the NFC sensor is located on the top edge of the phone.)

Start swiping near the camera on the back of your phone. Move the bookmark around until you hear a "beep" sound or vibration, indicating that your phone has detected the NFC signal from the bookmark.

Now, every time you can bring the bookmark near to this location, it will automatically open the browser, indicating that your tracking session has started. You can also check your reading progress later.