"configure project" grayed out in Qt Creator

I did and have the same issue. The problem is, that QtCreator does not have any kit preconfigured that could build the project and thus has nothing that could be configured.

Somewhere (in the official wiki I think) I also stumbled upon a YouTube link that explains how to set up a kit in QtCreator for building the project from Qt. Sadly I didn’t click it at the time. Does anybody still have that link?