I'm not sure that the above quote is a completed instruction? As in "type what?"Nearly there, you should be still in the control panel on the bottom line you should see SYSTEM Double click on it, COMPUTER NAME click CHANGE type in in Capital letters in COMPUTER NAME type
But if the general instructions got you going last time, then something minor may have changed. Are you using a router in your network? I think the gateway IP is that of your router, so maybe you'd need to open your router settings to see what it actually is using. Otherwise, leave the default gateway blank. Worth a shot anyway.
It is probably a good idea to power down both the Haas and the laptop after changing any network settings so that they can both start fresh.