How do you change the code on a school locker?

I've talked to the school counselors, janitors, and alsot the principal and they said that they cant change it because it is too much of a hle to fool with the computer system and change the code in the technelogical area.... my locker code is too hard to remember! I am very dislexic... i even had my best freind type this for me! If some one coule help me wtiht this then it would be greatly appreciated