How do you unblock websites at school:D

Nobody here is going to tell you how to do that.

You need to abide by your school rules, and one of those rules is not going to blocked websites.

Unblocking a website at school will get you either suspended or expelled. Time at school is not your personal time on the web. Save that for home.

You get your teacher or school IT person to do it.

There is no legal way to do it, since as a student you are not suppose to be using them for any improper usage.
So save the myspace and the other sites till you get home, and use school time for what it is suppose to be.

And as noted, even if someone put it down here we would delete the post and ban the poster for violation of site rules

We here at AMHD cannot help you get around any sort of administrative restrictions imposed on a School, Work, or any other network not owned and operated by yourself. These restrictions can include (but are not limited to): Website Blocking policies, Software Installation policies, Email retention policies, Software Configuration policies, Network/Internet usage policies, Network Configuration policies, Forum or Chat Room Bans, Game Server Bans, or any other actions that are deemed "unauthorized" by the owners/administrators of the network in question. Any actions by members of AMHD that would be offered to help in this manner would directly violate the site's TOS.

Petition the school board for a change, citing specific examples of sites that shouldn't be blocked.

Or, petition the company that handles the blocking for a manual review of a website that you need for educational purposes.

Bear in mind that neither of these is likely to accomplish anything, but it's the only way you normally have to challenge something that's blocked.