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Basically you download, install, run, select the browser you use and then start the test.
When it is done a page should open up linking to the fastest DNS servers for you, to change your computer to these DNS servers then check how to do so here assuming you are on windows 7: You must login or register to view this content.
Download: You must login or register to view this content.

For setting up on your router I recommend you do a search "How to change DNS servers on (router)"
Change (router) to the brand name of your router,
For example WNDR3400 Netgear is mine
I also have a different router hooked up I forgot the name and its shit, some apparent reason I cannot change it I must use linksys only >.<