how to password protect some internet sites?

@dubaimt (273)
United Arab Emirates
February 28, 2007 5:10am CST
i have done this before, asking for a password for certain sites to avoid my siblings visiting sites that they should not be. but i forgot how to do that.. this is without having to buy a certain software. can you please help? i have to do this to password protect some sites that nurses here in the medical center usually visit which is not in any relation to work. thanks!
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