First step in completing certificate, obviously, is registering for the certificate. I went to https://www.microsoft.com/learning/en-in/exam-70-480.aspx and selected Schedule with Prometric option. The sequence that I followed is to select the test center, select the exam name, select date and time for exam, create a prometric login id, pay the fees and its done.
I got a payment receipt with a confirmation number. I took a print and kept it ready for “c” day.