In the event the microphone becomes unresponsive, you can reboot it by holding the button down until the LED turns off and then back on as white. This may take a few seconds.
If you hold the button down longer and the LED turns blue, it will be in paring mode and to connect the mic with a phone it had previously been paired with the mic must be "forgotten" from the Bluetooth settings of the phone.
Once the above two steps are complete, tap the mic icon in the upper right of the Audigo app and follow the prompts on the screen to set up.