Hi Mike,
If an ESPproMon user plans to change their WiFi access point credentials or move their ESP8266 to another property the easiest way is to clear the EEPROM from the option within the smartphone app.
This will ensure that the ESP can be re-provisioned as covered in our article at Provisioning your ESP8266 with our server
The feature in the app should be used before the changes are made to your router or you move the ESP to another property or business.
If you forget to do it before the change / move the guide provides useful information on how to manually clear the EEPROM etc.