Create a Plex account through plex.tv. There are also options sign up using your Google or Facebook account.
FYI: You don't need to buy a Plex Pass.
Send me your username or email address via whatever form of communication you desire.
Once I receive your username/email, I'll send you an invitation to the YoMax Home Theater. Make sure you check your email and accept it.
Once accepted, you're all set! You can access YoMax by heading to the homepage or by going directly to YoMax.
You can also use your AppleTV, Fire TV, Roku, Xbox, PS4, mobile phone, and whatever other device supports Plex that I forgot.
Feel free to make requests for new content through YoMax Requests.