Five practices are characteristics of the fitrah: circumcision, shaving the pubic hairs, cutting the mustaches short, clipping the nails and plucking the hair of the armpits. (Reported in Sahih al-Bukhari and Sahih Muslim)
And although the Quran is silent on pubic hair, it does say that everyone must do whatever Muhammad says.
And whatsoever the messenger giveth you, take it. And whatsoever he forbiddeth, abstain (from it). And keep your duty to Allah. Lo! Allah is stern in reprisal. Quran 59:7
So Muhammad says you must shave your pubic hair, and the Quran says you must do whatever Muhammad tells you to do. Now that you know, you have no excuse.
Here are detailed instructions on just how to do it.
It's a bit complicated ("...start shaving the pubic hair from beneath the navel, and to start on the right hand side...").
Be sure to read the instructions before starting.
