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How do I change my lock combination? - letter combination lock

I look like a block, which reads as a password to lock http://www.masterlock.com/cgi-bin/product_detail.pl?dir=/residential/schoolcampus/&displaynav=&sub_cat_id=D1534&template=style. No rotation of things with numbers and letters. I know one my current password, but want to help. What!