I just bought a new Airport Extreme router. I did set it up and then it appears like this:
The first Airport Extreme is mine. The other two aren't mine. I live in a dorm in university, and each room has a ethernet port and I just plug in the ethernet wire from the port to the Airport Extreme. How could I remove other's airports? Thank you very much.

The first Airport Extreme is mine. The other two aren't mine. I live in a dorm in university, and each room has a ethernet port and I just plug in the ethernet wire from the port to the Airport Extreme. How could I remove other's airports? Thank you very much.