Originally Posted by Miles Ahead

You will exit UA975, and clear immigration. You're now in Schengen-land.

If you're in a part of the airport without signs for connections (and I am afraid there are more than a few of those), follow the signs for baggage claim or "Sortie Geneve". Continue until you get just before the baggage claim room, and you'll see on your left an escalator tucked in the back, with a sign saying "Secteur France" on it. Take it up one level, and then stop following the signs to France.

One more level up is a Swiss Business lounge (at the end of the hall) and a Senator lounge (just up the escalator). Or you can go directly to your gate. Most LH flights leave from the A gates. Security takes typically 15 minutes.

If you screw up, don't worry. Exit customs, go up two escalators, and then depart again. You'll need to show your boarding pass. This will add 5-10 minutes.