HC-05 changing PASSWORD

any buddy can tell how to change hc-05 password.

what is a hc-05? do you have a link? what did you try so far?

http://arduinofy.blogspot.com.au/2013/10/tutorial-programming-hc-05-at-mode-with.html

but i got one error in compiling

SoftwareSerial BT(A0, A1); // RX | TX