[Koha] MySQL password at Koha Live DVD

Hi, After install Koha Live DVD from http://sourceforge.net/projects/kohalivedvd/ successfully, I added Traditional Chinese po files. I changed user password at koha and ubuntu successfully. But, how to change the password at MySQL? Could someone give me a hint? -- Wishing you all the best. . . . Anthony Mao 毛慶禎 ＋886 2 29052334 (voice) + 886 2 29017405 (FAX)