By default, the SSID of the Workgroup Bridge is tsunami, and it tries to acquire an IP address over the wireless link through DHCP. Wired Equivalent Privacy (WEP) is off by default. If an IP address is already configured, you might make a Telnet connection or browse to that IP address. These default settings apply to a 350 series WGB that run the firmware version 8.89.
You can also reset the WGB to factory defaults, with the use of a paper clip on the small reset hole, and then use the default address 192.168.200.1 in order to access it if DHCP fails.