The Fundamentals of Engineering (FE) exam is generally your first step in the process to becoming a licensed professional engineer (P.E.)
The Principles and Practice of Engineering (PE) exam tests for a minimum level of competency in a particular engineering discipline.
You’ll register directly through the National Council of Examiners for Engineering and Surveying (NCEES) at ncees.org. From there, you’ll create an account, select your specific FE exam (Civil, Mechanical, Chemical, Electrical, etc.), pay the fee, and choose your testing date/location.