Paulo Rogério de Oliveira You can change it at easy, using repetier host, i.e. Just connect RH to arduino and Alt+E. When you upload firmware first time, default values (from configuration.h) copy to eeprom. When you upload it again, eeprom is already there, and will ignore your new defaults. .
i made changes to the firmware and uploaded it as it confirms that it took but i change the defaults from 200, 200 to 100, 100 but it does not take or show up on the lcd.