After creating the content suggestion boxes for getting to the setup page click on "Edit"
On the opening setup page we can easily edit the name ("Name") of the suggestion boxes, number of rows ("Rows") and also the number of columns ("Columns"). In the "Custom CSS" field we can edit the the graphical appearance of the created content suggestion boxes. Because of the box is based on iframe, the css selectors could be concern only the internal elements of the iframe.
To save the changes click on "Save"!
The saved changes automatically sychronising in every hours!