I am a over stay student from and im from nepal. my visa was expired in september 2010and unfortunately i have?

lost my pword before one and half yr when i was legal. so now i want to back my country nepal and im ready to buy ticket for it bt i dont have my pword..what should i do plz .?im also ready to pay for my new pword bcz i need to have pword to leave from australia. and i have my ols laptop and a phone with me did they take it when i go by my own ticket to home..?