The default settings are:
IP address= 192.168.2.1 255.255.255.0
Password= (there is no password by default)
With your network setup on a different subnet, this means you will need to statically assign your workstation in the 192.168.2.1 subnet. Then http to 192.168.2.1 in order to manage the switch. Once you are able to access the management interface, you can then change the IP address, username, and password. Once those setting have been changed you should then be able to access the switch from the subnet used on the rest of the network.