How do i reset an opened combination lock to close and reset code

SOURCE: how to reset an open master lock

your answer is on this site
http://www.masterlock.com/faq/lostcombo.shtml

SOURCE: My friends were messing around

Make your dumb friends find the code or buy you a new lock.
there is not trick to it... it'll have to be done by trial and error...
Sorry for your troubles.