Images / Captions Not Centering Vertically or Horizontally

I have 3 quick questions related to the image on this page: http://www.wellbuzz.com/dr-oz-diet/12-ways-to-burn-fat-while-you-sleep/

1. Can you please tell me how to adjust the css so that the image is centered horizontally (so the same amount of white space padding is on the right and on the left)?

2. Can you also tell me how to make it so there is the same amount of white space padding above the image as there is beneath it?

3. And lastly, can you please tell me how to adjust the css so that the caption beneath the photo is centered horizontally?

I have granted wpmu admin support via the wp plugin, in case that is helpful...