Tap the groups button on the My Device screen, you can then add, edit, or delete camera groups.
Tap the Me tab at the bottom of the screen, then go to Tool. From here you can tap on Wi-Fi Detection Tool which will take you through the process of checking the network.
Tap the Me tab at the bottom of the screen, then go to Settings, then Account and Security. From here you can tap on Delete Device to remove any device that has been offline for more the 5 minutes.