Here are descriptions of every setup item:
SSID:
The Service Set IDentifier of wireless access point
or other network device. You can think it as the
name of access point of wireless device.
BSSID:
The MAC address of wireless access point or other
network device. Unlike SSID, BSSID of every access
point or network device is unique, and will not be
the same with others. So you can identify a single
access point or wireless device from others by
BSSID, if they all have the same SSID.
Signal:
Shows the signal strength of access point or wireless
device. Larger number means better radio strength,