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You can tell the network to automatically connect to a network, it's a checkbox. Click on "advanced settings", then "edit" when you have your wifi network selected or just try free finevpn to change...

First, I'm not sure what you mean with "ethernet input from n°1 to n°4", I will assume that those are LAN ports and your router is connected to a modem using the WAN port or that you have a DSL line...