Configure network and default password

I tried to configure the preinit ip address in menuconfig but this address is not reachable. Only 192.168.1.1 is and ssh is opened without a password. Is there any way to change this address and set the default ssh password?

Did you change default ip in here?

http://www.picz.ge/img/s1/1706/12/8/8b94419c83b2.jpg

I have changed it too and compiled firmware but i did not flash yet. So it will not work right?

I am also interested to make my own configuration to the firmware and compile it. So that when i install it will be configured already.