Connection of my wi-fi network

• I cannot install a new home in the Home + Control App. What should I do?
• A product appears as "unreachable" in the App. What can I do?
• I can't connect my gateway power outlet / module to the Internet. What should I do?
• I do not see my Wi-Fi network in the list of networks suggested. What should I do?
• My "...with Netatmo" installation's gateway power outlet / module has disconnected. What should I do?
• I changed my Internet router code, or changed my router; how do I reconfigure my Wi-Fi with my "...with Netatmo" installation?
• With what types of Wi-Fi networks can the gateway power outlet / module be configured?