Importing target database in old project [Unity 5.5]

Hi
Need a refresher on importing a target database into an older Unity project. This is a Vuforia project created using Unity 5.5!

So I've created, downloaded and applied a new App License Key.
I've also modified and downloaded a new Target Database.
But how to use? Do I simply import this package into my project? Do I first have to delete the old database?

The getting started tutorial is woefully inadequate and doesn't seem to cover this important step.



https://library.vuforia.com/articles/Training/getting-started-with-vuforia-in-unity.html