i want to make a picture like this:
http://img.photobucket.com/albums/v237/rion_lee/rion-lite.jpg
How to i change the shutter's speed on my camera?
I would like to add to what our Princess' answered (which is actually correct), with that long exposure it is impossible that you can get a good picture, only by a handhold. I suggest that it is necessary to use a tripod and set it to higher ISO.
How to i change the shutter's speed on my camera?
You have a point and shoot with little to no manual features. You pretty much have no control over your camera. You can't choose how long or short you want the shutter speed to be.
You might be able to get a 4 sec exposure on night scene mode.