Hi, I can't seem to properly change my desktop image in OS 10.1 I have seen various instructions, but none of them work. For example, it has been said that I should go to finder, select preferences, and then click the select picture button. Easy enough, but I don't have a 'select picture' button when I click finder>preferences. I then saved an image to disk then brought it up in the desktop section and then changed the wallpaper there, but it is shown in a tile formation, I can not find a way to center the image on my desktop. Is there any easy way to set the desktop image and the way it is presented (centered, or tile)? Any help would be appreciated!!