[Q] re-unlock bootloader

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http://forum.xda-developers.com – i think i made a mistake.. i relocked the bootloader..i know i dont have to do it..but i learned my lesson my phone still works fine..but the problem i see here i am not able to access anything. i mean super user is not giving root permission.. i am new to this custom Rom installation..only yesterday i saw about it. and tried.i dont know much about it..everything is new to me.. i am very happy to use this custom version of xperia S, can anyone tell me how i can re-unlock bootloader of my xperia x10i, now X10S.. Had anyone tried it before? thanks in advance.. (HowTos)