Every device has the NFC reader located in a different area. Typically the reader is at the back of most smart devices. Most commonly for iOS devices, it is located near the top while Android may have it placed more towards the center.
If your device has background scanning functionality, you can practise Tap & Holding a new aamilet to your device before connecting its NFC to your Account. The device should vibrate and show an “NFC Not Found” message when you have found the NFC read area.