CMS searxh with attributes


i would like to do a project similar to this one with search suggestions within a cms collection list.
CMS Predictive Search - Webflow.
They said i need to add the script to my project, which I did.

They write that I need to add those Attributes as well but I don´t know how.
Can someone help me?

Follow the great help that the project provides. Attributes have to be put here: