If you are logged into a computer as a student in grades K-8th,  YouTube will be blocked.  If you should be allowed access to YouTube, make sure the filter knows who you are - try to go to a blocked website - like www.facebook.com.  On the blue block page in the upper left side you should see:    If you don't see your name, that means the filter does not know that you should be allowed to access to youtube.  Click "Not you?" and then log in with your network username and password (the one you use when you log into your computer in the morning).