Sorry Gambit I still no understand...

I am not sure where or how to turn it

? Where is it safe to turn it and what do I use to turn it? I know I am probably making a mountain out of a mole hill here, sorry... :embarassed:
I have only experience with a SOHC engine, where you normally have a ridge in the centre of the cam, where you can safely place an adjustable spanner around the cam and turn it.
Cheers.