I'd like to start using Gnucash to manage some stuff, but I need to get my credit union into the OFX database before i can get my account to sync.  I see the link to 'add institution' but I need some help on what the terms there mean so I can get the information from my credit union.

The form asks for the following

Insitution Name -- simple enough, right?
FI Id -- What's this?
FI Org -- What's this?
FI URL -- URL to their website or their OFX server?  Something else?
FI Broker Id -- What's this?
FI Bank Id -- What's this?