If you can't connect your nevo with the Android app and you are running Android 6 you should follow the following steps to make it connect.
1. Go to your system settings
2. Choose Apps
3. Go to Nevo
4. Choose Permissions
5. Enable Location, if this permission was already enabled, turn it off and on again.
6. Also enable location & bluetooth in the notification tool bar.
If you've done this you should be able to find your watch with the nevo app.
Make sure that the location & bluetooth is always on. Android 6 requires location services to scan for bluetooth devices. If you've any more problems please open a support ticket so we can help you out further.