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@deleted
A sprocket and a cog are the same thing. Take your wheel off. You screw the cog on to the hub and then use a chain whip to tighten it. You can tighten it ok just by putting the chain on, putting the wheel in the frame so the chain is tight and pedaling forward; but it's better to use a chain whip.
The lockring goes on the outside of the cog; it will screw in in the opposite direction to the cog. you can use a lock ring tool to tighten it or use a large screwdriver to press on the indentation till it's tight. It's important that it is really tight against the cog.
Grease the threads before you install either the cog or the lockring. Make sure your wheel nuts are tight when you fit the wheel back in to the frame.
If you don't know Sheldon Brown then google him; his site has pretty much everything you will need to know. Except advice on the skinniness of your jeans.