Difficulty locating QT SDK directory

[SlappyDanger]

I am trying to figure out how to use QML-Box2d to handle some physics for a simple application I am making.

Here is a screenshot from the wiki (wiki.qt.io) that i've been trying to follow:

Here is a screenshot from the GitHub page for QML-Box2d:

I cannot find the imports at all.

Does the directory already exist? If no, the answer is simple, I will just create it.
I'm just terribly lost on where I meant to place these files. Thanks for your help.