Read Paul's message #4 again. He describes exactly how to code the path to the images on your css sheet.
In your CSS sheet,
background-image: url('<font color='"#FF0000"'>../</font>img/categories/dairy.jpg'); /* notice the <font color='"#FF0000"'>../</font> leading the path? */
Repeat this change on the css sheet for all of the images that are missing,
see Lines 95, 186, 191, 196.
Also, rename the image "fruit & veg.jpg" to "fruit-and-veg.jpg" or something without spaces.