As the other girls have said don't use the flash and therefore you really really need to use a tripod or something to rest the camera on otherwise you will get camera shake (blur).

If you have a manual control setting on your camera, try setting the ISO to around 400 (any higher and your photo may be grainy), also set a longer shutter speed (Tv) and a wide apeture value (Av).

If you don't have full manual control on your camera you might have semi-automatic controls which means you can set one of the above values yourself and the camera will work out the rest.

HTH.