It won't let me change my pword or cancel it or anything! Hellllllllllllllllllllllllllll…

wanted to block yahoo answeres on my computer. (long story, my daughter was posting her pictuers on here) Now when I do anything on Yahoo, this box comes up saying I need to type in my pword. It's gettinf highly annoying, I did the whole tools, internet options, content, enable thig. But when I click ebable it askes for the pword and when I type it in nothing happens. like it goes back the the box where is has the enable on and when I press it again it justs asks for the pword again. How do I fix it so the pword box stops popping up?