EDIT ... if you want a blurred background it is easy enough to do this in editing by duplicating the image, blurring the top layer and then erasing the portion of the top layer you want to be sharp, revealing the sharp image in the bottom layer. If it has fine detailed edges it may be preferable to use a layer mask but usualy a soft erase brush works well and avoids the 'cut-out' look. IMO rarely is the b/g sufficiently out of focus in-camera so I do not bother, knowing I can do it in editing. But you do need to have practiced as much with your editor as with your camera to adopt such an approach.
E2 .... if your editor doesn't have the layers ability there is a free download which does a reasonable job Paint.Net.