Adjusting Ohlins

Anyone Know how to adjust Ohlins shocks?
I have tried to undo the locking ring or at least that’s what I think it is, and no success.. using 2 c spanner’s and whacking one with a mallet... still nothing.. and the locking rings are perfectly lined up.....
I can turn the whole assembly including the spring by just twisting it
Am I missing something?

 

Thanks for that.. it looks like I was going the wrong way....and it looks like mine are at the softest setting already.. and I was wanting to make them softer....