Patrilux on "[Plugin: WooCommerce - excelling eCommerce] How to add a 'shopping' option to each post."

I'd like to insert some sort of code/shortcode to my existent posts so I can sell the product (in this case, photos) I already have on my website.

I offer 3 different sizes (not sure if this makes things more difficult or not...)

Can someone explain to me the easiest possible way to do this?

Thanks!

Here's the site: india.x10.bz

http://wordpress.org/extend/plugins/woocommerce/