Arduino Project wifi module esp-14 configuration

hi,
i want ti configure an wifi module esp-14 with arduino using AT commands but it doesn't work i don't know where is the problem.To the arduino serial monitor it is written that the wifi shield is not present.I wonder if the pin connection are just VCC,GRD,TX and RX serial connectors.
Normally if you write AT the response have to be OK but it's not the case. I need help