Firstly, make sure they are fully charged. Then put them in your ear and press the black power button and hold it down until you hear a voice say "power on, battery good".
Then go to the Bluetooth settings on your phone, make sure Bluetooth is on. Hit the 'scan" button if it does not automatically start scanning for devices. "JBL Reflect Mini2" should appear in your devices list, tap to connect. You will hear a voice say, "connected"! The earphones should now show "connected" on your phone and be in the paired list.