Set up help with my MI Box

So i installed kodi from google. Then when i open it i see something different from all the youtube videos.
The screen is blue. Theres a sidebar that says kodi and below it movies, tv shows, ect.
And on the right side it says your library is currently empty
But theres not a system section to add stuff or anything like that.
Did i do something wrong durring the set up?
All help is appreciated