If I remember correctly, if you are able to connect via Wi-Fi then connect to the Raspberry Pi Hotspot and use VNC to connect and configure the Pi as needed.
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If you have to connect wired then I think you might need a keyboard.
I got an HDMI cable today, and have the JMRI home page displaying on my monitor! The USB mouse works, too.? :--)
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I suppose I'll need a keyboard connected to the Pi to configure it to connect to the router, at least. I'm debating whether to borrow the one from our primary computer, or spend the $20 or so to get another wireless keyboard and mouse for it. It they could serve as backups to the ones on our primary computer, too.
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It's beastly hot here this afternoon, and the car is out baking in the hot sun. I think I'll read Steve's documentation for a while first!