Can’t launch the app.

Hello helpful neighbors.
I am a newbe, and I just went through the painful experience with loading Kodi Crypton 17.1. When I finished and exited my loading effort, I tried to launch Kodi and got the Kodi-setup screen again.
What did I do wrong?
Who can help? This could not be the first time that this had happened.
Thanks for any help someone can provide.