1. Surf to brainbench.com
2. Take their free Project Management exam.
3. If you get at least 75%, fill out the PMI application and sit for the exam.
4. If you get less than 75%, surf the PMI website, and those of the PMI chapters, and take their various sample exams, plus read PMBOK and an undergraduate text that explains CPM, PERT, etc., then sit for the exam.