Charging up my camper from the house

Hi, I know this has probably been asked somewhere before but I have to admit to being a bit dumb when it comes to all of this so replies I have seen that mention voltage etc send my head into a spin.

I am going away to my mums for xmas in my van and have bought an adapter to hook up to the house electrics. I have the van plugged in now in order to get some charge for if we have to stop over night tonight.

So I've plugged in. Switched the switch on the zig unit so it is on to the picture of the van parked up. (switch has a pic of van being driven above it, and below has a pic of van parked up under a tree). I've got it on to the pic of van under the tree.

So my question is....Is the van charging now? If not what do I need to do? I am in no way technically minded and need very simple answers.

Many thanks in anticipation...and Merry Christmas to one and all

Only sure fire way of knowing is to get a cheap multimeter to register any voltage difference when on....another way would be to listen to the battery after a while to see if you can hear any fizzing/gassing noises indicating its being charged.
I'd guess the pic of the van parked up may be the right one but don't really know for sure...the pic of van being driven (I'd guess) means that when driving the battery is being charged from the alternator...under the tree (I'd guess) means you are camping and are using the battery for power.
Someone who knows for sure may like to chip in..........