Settings for dimly lit work like this would be:
ISO - as high as it goes.
Aparture - as wide as it goes (a low number - 2.8 is wider than 4)
Shutter speed - hope it's high enough!
Flash - off
I'm not sure what shooting modes your camera has, but you should be able to set ISO independantly at least. If you have an Aparture priority mode (marked A or Av) change to that and set the aparture as wide as possible.
If you only have a program mode, see if you can dial in a couple of stops of underexposure. This often doesn't make the picture too dark, but be careful
A final useful setting would be spot metering, but it's generally reserved for fairly advanced cameras.