To register for the CISSP first go to ISC2′s exam search page. This page handles the registration for the testing and training. If you only want to schedule the exam and not training, make sure you set the “type” drop down selector to “examination”. Otherwise you’ll spend 10 minutes trying to find the perfect location and date, only to learn that the exam isn’t open to you.
Unless you live in a really big city it’s best to only select your Country/State, and then just scroll through the options for city and date. The examination locations are usually either an educational institution or a hotel. I’ve taken test in both and prefer hotels. For me, the examinations are usually a long drive and early in the morning. So I prefer to stay in the hotel, get a good nights sleep, and wake up to a nice breakfast.
If you’re taking the exam following training then the vendor will set up the exam for you, all you will have to do is fax them paperwork.