Q: please i want to change my adress besouse by mistake i wrote my sis one and now i cant change it. please help. thank you BR

You can not change an @icloud.com email address after you create it.  But you can create an email alias to use instead, which will receive email in your current iCloud inbox.  This explains how to creat an email alias: http://help.apple.com/icloud/#mm6b1a490a.