Need help in AT and Pair mode in bluetooth module HC-05

I have now a hc-05 Bluetooth module that I newly bought. I know that there are 2 modes AT mode and connection mode. What distinguish connection mode is fast blinking led. When I plugged the 3.3 volts to it, it starts with pair mode and don't accept any commands. I want to turn it to the AT mode which I can reconfigure it as I want.