Scanner On Hp G85 Is Not Working If I Scan A Picture On My HP Photosmart Scanner, How Do I Enlarge The Picture?

If I scan a picture on my HP photosmart scanner, how do I enlarge the picture? - scanner on hp g85 is not working

I want to scan and share some pictures on my facebook, if I try to reach small contribution. I use HP Photosmart scanner, and HP Photosmart Premier for editing. Someone knows how I fly the pictures in full size?