No water in the toilet

Hi, my toilet want fill up with water, from reading various posts, i think the problem is the inlet value probably needs replaced from this thread (http://www.diynot.com/diy/threads/toilet-slow-to-fill-up-cistern-after-flushing.202360/page-2). I have got the part but i cant work out how to get the bolt off to replace it…..i have tried turning left/right, tried using those grip things from the kitchen. Do i need a tool to open it and which direction should i be doing it in?

One…

No water in the toilet