How to block a website completely?

My whole family kept on downloading and updating apps on their phone which is pissing me off and I don't mean not to let them access internet. It's just that they're downloading too much and it makes the internet so slow. I configured my router to block the website where the download is coming from. But... show more My whole family kept on downloading and updating apps on their phone which is pissing me off and I don't mean not to let them access internet. It's just that they're downloading too much and it makes the internet so slow. I configured my router to block the website where the download is coming from. But after blocking it. They can still access it. I typed in play.google.com (bcoz all of them is on android) and the url itself cant be accessed but when accessing a particular app but the url is still the same (example: play.google.com\apps\facebook). it works (I mean it wont block it). What do I type in to completely block a website. BTW I'm using AirLink101 AR670W
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