On the day of your CBTF Online exam reservation, the main CBTF page will have a green button for "Check-in":
That page contains all of the instructions and actions necessary for students to self check-in to their exam. Check-in is available 10 minutes the reservation time to 10 minutes afterwards.
Pre-Checkin instructions are listed to describe what to do prior to your exam. This is mainly to prepare your workspace and materials for the exam.
Post-Checkin instructions are shown after the green check-in button is pressed and will include any links, procedures, instructions, etc. to access your exam.