where to configure the datasource in the grid gk5 module

Hi,
I bought the template https://demo.gavick.com/joomla25/musicstate/ and installed the qucikstart version. At the home screen is a section called "best albums". I found out, that this section is a grid gk5 module. I could also find the shown articles and the corresponding category.

But what I couldn't find is the link between den module and the shown category? How and where can I configure the grid gk5 module to tell him which articles it should use or which categorie items it should display? There is no data source configuration field available...

THANK YOU

The Grid module uses other module positions to create the view, so you should search on those module positions where you will find NSP module or other one - editing them will allow you to change data source.