The only way that I know of being able to focus and unfocus or depth of field is by using a SLR. I looked up your type of camera and I do not think that it has the capablities to make the background or fore-ground blur. I do not know if this helps or not, but you cna always try looking in you manual.
Its hard to achieve that kind of background blur using a compact camera due to the small size of the sensor.
but here is what you can do, choose a background that is far from your subject, zoom in all the way to your subject, 4x zoom rite? go as close as possible to your subject, try use macro mode and shoot. Think thats the only way you can do it, or you can get an slr