Create your profile so you can book slots with celebrities - you’ll need your Gamertag/PSN to register
You can search by celebrity or game and see what slots are available here
After you request to play a celebrity, you’ll get an email confirming the request. If multiple players request to play in the same slot - you may not be accepted, but try again!
Once the payment is made, make sure you are online 5 minutes before the allotted time and the celebrity will invite you to play!