You on PS4? Or Xbox One?
You quit to the dashboard of whatever system you are on. You'll want to go into system storage if it's PS4 (not sure the exact names) and you will delete the NBA 2K14 game file (not the save files). You should see memory from your HD clear up showing you it has been uninstalled.
You can then proceed to click on the game again as if you were to start it up and it should prompt a download and install.
Then you wait and when it's done...voila!