Emby is a very simple app to use, It can be installed on most smart TVs, firestick, android boxes, computers phones etc.
#1 Emby is a self hosting media service, you will need a FREE emby account. Please sign up HERE
You now have an emby account, If you want you can install the emby server on your home computer and add you favorite media. It will index and give you access.
#2 If you have signed up to rent server access from someone, Now is the time to go to their website and signup, be sure to use the same email address you used when you got your free emby account.
#3 Check you email for an invite to join the server. Accept it.
That is it you are done, you can now sign into emby on any of your devices. using your emby username and it will allow you to access the media.
Emby tracks your watch progress across your account, so any device you log into with your emby account will show what you are currently watching.
Thank You Enjoy!