Craig,
Go into your 'Gallery' and double click on the picture which you want to delete.
Then scroll down to the 'Photo Details' and under the heading of 'Medium Image' you will see something similar to
{img}
http://clubcobra.com/photopost/data/500.
Highlight that heading by left clicking on it and it will change to a blue colour. Holding the cursor arrow on that blue box, right click and you will find a drop down screen will appear with among other things, the word 'delete' endorsed in it. Left click that 'delete' and your photo is gonsky.
Baz.