If I'm interpreting the pictures correctly, it looks like the 240v wall plug has been removed from the cable. (See red arrows in the pic below.) They would need to be reconnected. Alternatively, you could just attach a 120v standard wall plug directly to the cable. I'll link a video below.
The bike end of the charger (blue arrow) plugs into the bike under the rubber flap just in front of the seat. I'll also link a video on how to connect the bike to the charger.
View attachment 8044
Here is a video on how to make an adapter to for the 240v plug. But you can also use the same schematic to just put a 120v plug on the end of the wire using the green, black and white wire.
Here is a video on how the charger connects to the bike. This one is using an adapter to go from the 240v plug to a 120v plug (as described in the previously linked video), but shows where you plug the bike in and how to get the charging process started.
There are quite a few Alta folks in PA, so I would think we can get you goDoes it make any difference whether the black or white conductor on the charger side is energized?