Fred Extending my L visa issued in Hong Kong

Hi, I have an Australian passport and have been issued with a one month L to China. I entered China on 22nd October. My first question is if I have to register at the local police station if I entered with a tourist L. I am staying with a friend in Kaifeng, Henan province. My second question is if it is possible to extend my L at a local Exit-Entry Administration Bureau for a further month. Your advice would be much appreciated. Thank you. Fred