I shall post some pics up :D
Here we are:
So the red box simbolizes where the opacity changer is. Simply click on the layer you would like to change the transparency of. (Sorry about the random pics. :-[) And then…
http://i34.photobucket.com/albums/d147/Katty992/1.png
Drag the opacity down to whatever transparency you think best suits your picture!
http://i34.photobucket.com/albums/d147/Katty992/2.png
Hope I helped. :)Katherine x