A and S are the modes you should always use, M is for when those don't cut it and you need to take control, remember, when shooting in raw, you can digitally increase the exposure level two levels without quality loss on the computer.
so since I said use a large aperture, set it to A mode and crank that aperture up, which is a bit backwards since large aperture is low number
The numbers that change from single digits with ¨ behind it to 1600+ is the shutter speed, ie how fast it takes the picture. in A mode you wno't see this, this one gets changed automatically
The number with a point separation is the Aperture, for night shot, keep isn't as low as possible, on your lens that is probably somewhere int he range of 2.8-4,3 ish, the reason for the range is that it is a "cheap" zoom lens, and on larger zoom you lose light and the aperture gets numerically higher, the actual aperture I believe is the same but it's more about the amount of light coming through.
You could also shoot in night mode, but then it might take to long to take the shots and be blurry.
So, Set your aperture to the largest opening/lowest number, in A mode, and change the ISO to really high, I believe your camera shoudl be able to handle 1600 with acceptable nose levels. at 800-1200 you'll have less noise but may need to sacrifice more blur.