There's a photo strip link on the internet somewhere but I couldn't find it, sorry.
Anyway... Lay keg on its side, pointing away from everything or you will end up with beer dregs all over you. Then with either a ball headed hammer or a solid flathead screwdriver push hard against the ball valve to release the CO2. At first the noise and pressure with scare you, but it's all okay... it will take about 5-8 seconds to release all the CO2.
Note: If using a hammer place a tea-towel over the head of the hammer (helps to keep you dry), if using a screwdriver push it in on the side of the ball valve.
Hope this helps... good luck
Cheers
Carboy :icon_cheers: