Sorry mate, I misread you, I think. I thought you said you CAN download them to your computer, and needed to know how to resize them. There is a thread regarding resizing images
here and another one
here.
I assume then that you mean you want to change the resolution of the camera to a different setting? I have a Canon A40, which is the generation before the Cyber-Shot. I'm not sure how similar they are, but on mine I have to press the Menu button and scroll across the icons until I get to the one for image size. I then press the 'Ok' button and scroll through the different resolutions available. I can also change the picture quality in a similar fashion. Hopefully yours is similar.
🙂