Help removing rear cassette (see pics)

[roooseter]

I need help removing this rear casette, tired seems stuck, i have cassette sprocket and chain wip

 

[T4tomo]

You have the wrong tool, you need a FR 1.3 remover as that is a freewheel not a cassette

if its really jammed on - I.e big spanner wont shift it. put the end of tool in a vice and turn the wheel in the correct direction.

 

[Rickshaw Phil]

Hi and to the site:

I may be wrong but that looks like a screw-on freewheel to me. It takes a different tool to a cassette and the whole thing unscrews rather than just undoing a lock ring. If this is the case it will need a lot of leverage - a breaker bar if you have one or I have had success in the past with extending automotive wheel nut wrenches.

 

[Ajax Bay]

As @T4tomo said, you show a cassette lockring/freehub tool and you need one for a freewheel.
These are often a b****** to shift (from the image this will be its first (and ?last) time. You need to ensure the tool doesn't slip out and will (as Phil says) very likely need a steel extension to however your applying unscrewing (normal direction) torque, or maybe @T4tomo 's vice technique (care with direction but often you can't generate enough torque).
Consider whether removal is necessary.

 

[Cycleops]

You can remove it without the tool but you'll completely destroy the freewheel. Fine if it's completely buggered. As said if you don't have to leave it.

 

[Big John]

Special tool for that one that needs sticking in a vice and then use the full diameter of the wheel to give enough leverage. A bugger to shift but very doable with the right tool AND a vice.