Changing cassette fail

[Nexus6]

Hi all. 1st time post. I am unablr to remove the cassette from my rear tyre. I followed the easy tutorial on bikeradar but havent managed to get any success.

See link to pics of my cassette and the lockring i bought. http://s1067.photobucket.com/user/Nexus62/library/Mobile%20Uploads

I think i know where i went wrong. The lockring i purchased didnt fit properly, so i just used a spanner to remove the bolt. Now all that is left on the wheel is the old cassette..

Help pls!

Sorry if this is a complete durrbrain question but videos online are not helping so far.