Nothing to worry about!
If you accidentally unpaired your Monimoto from your phone using App - Settings - Connect button (phone/tracker close by) - Unpair, then your device is ready to be re-paired and simply start pairing process in the app again.
Unless you are an iPhone user and have an MM1-MM4. If so, go to phone settings, go to Bluetooth, select the device mm.xxxxxxxxxx, click the (i) icon and tap forget this device. Then you can pair your Monimoto again in the app.