please help, Please answer the steps on the Windows 11 device.

Create a network of four computers using wired or wireless connections, and the network allows you to send messages from one device to another and share resources like printers or other devices.

You are supposed to use the command prompt cmd to send chats, but if your windows is home edition may be it will not support this way. So you can download an application to use it but you must use it with your local network not the internet(the devices must not be connected to the internet)