How do you change your username to log in on the internet?

it's on a school laptop and half of everything on google is blocked so I want to change my username please help !
Asked Apr 18, 2013
that wont work xD use a proxy
Answered Apr 18, 2013
whats a proxy
amor_b Apr 18, 2013
it's a block site thanks anyway !
amor_b Apr 18, 2013
yea proxys get past school servers but most get blocked

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