Canon sd900

I seldom use my canon sd900 and I usually take pictures without using the flash. But I recently noticed that my hands should be very very steady, just a slight movement will cause the picture to be blurry or unclear. I usually don’t use the flash because it gives a darker background with your face too white from the flash. And my problem arises when I would request other people to take my picture because 90% don’t have a steady hand thus giving me a blurry picture.

However, I noticed that when I use the flash even if I am shaking the camera while taking picture, it still gives a clear picture. But when you shake the camera without using the flash it gives a very blurry picture.

I prefer not to use the flash and would like to know how to modify the settings of my camera so that whenever I let other take my picture without the flash, it could result to a clear image. Can somebody please help me? I would really appreciate it! Thank you.