Ask for help, there are multiple computers at home, a router has been connected in the living room,

Also uploaded a picture??? Why don't you see the antenna?

Get a wireless router and add a few wireless network cards. Just install it.

All you need to do is buy a wireless router, pull the cable into the room where you want to install wireless (free of charge if you have one), and plug it into the wireless router you bought. If the original router has no network restrictions (that is, the computer can be plugged in to access the Internet), then you can plug in the LAN port of the wireless router, and then connect your wireless device to the wireless router and you can go online! If there is a limit, you can only ask the administrator of the original router to install the settings for you.

That's more troublesome.

Swap this one out for a wireless router and you can use it anywhere in any room in your house.