After you apply to take the PHR or SPHR Exam and your application has been approved and you have received the authorization-to-test (ATT) email, you're now cleared to schedule when you want to take the exam. Both the PHR and SPHR exams are administered through Prometric.
The receipt page of your application payment will have a link to the Prometric website. Check out the site for this information as well as other fascinating insights to preparing for exam day.