hey myspacer! you know what? i found one new way how to change myspace url. but i want to remember u that it didn't work 100% maybe just 34%. because it only work for myspace who had did his/her url myspace.
first step, you must go to this link, http://messaging.myspace.com/index.cfm?fuseaction=mailsetup.createaccount
then you enter the blank form. (look at the pic.)
click Create My Email! and follow the next step and you are done.
now, you had got ur new myspace url. u never cant change it anymore because it just can used once time. so, pick ur new myspace url carefully and enjoy with it.