Once the iterator has been set up, you will have to create an object where you will put fields in it to bind the specific data you want to display.
In the Palette, search for "object" component and Drag & Drop it in the Iterator. In this use case, let's put 4 fields item: One for the id, one for the authors, one for the location and one for the title.
Double click the Iterator item to display the Source Picker tab, and open the row schema and drag & drop each item you need : open the id item and drag & drop the "txt" value in your id field and choose "Value". Repeat it for the 3 others.