Assuming you go to the "upload file" part of the gallery, something should pop up with a list of files. You're looking for either EA or Sims 3. (it may vary from computer to computer) Once you get to Sims 3, then click on Screenshots. You will have a bunch of screenshot taken from in-game (you can take these screenshot by hitting "c" within the game) and you simply pick the one you want. I hope that helps.