From the image, you have to “client”.

One client is the “WOW Fi”, which is the Internet. This is fine.

Another client is the one you marked. But as client is the uplink, i.e. Internet, you really do not need this.

Your Master (AP) is disabled. So the router does not broadcast wifi.

Supposing your WOW Fi FASTWEB is connected normal, you need to set up firewall correctly so that you have Internet. e.g. your client wifi interface is wlan0-1. You need to include it in the wan zone.