Q: Using Zterm with Keyspan serial USB adapter

Can anyone shed some light on how do I use Zterm with a Keyspan serial USB adapter?
I loaded the driver that came with with Keyspan, now how to I configure Zterm to use the USB port to talk to a deviced connected to it?

TIA

Can anyone show me how do I tell ZTerm to use the Keyspan adaptor?
By default it tries to use the modem.