Go to Interface
> Credits
. It is one single form with all the relevant options.
This page looks very similar to the [main menu]: you can specify the background music, the background image, the font's size, style, color etc.
Just like the other menu entries under the Interface menu, this also has a "Preview" button at the bottom.
To select the background music and image.
Specifies the category header's font.
The normal font to be used with authors' names.
Selects the author list for that category.
When you select a name, the "Erase" button will became active and you'll be able to remove. If you enter a name into the input box below the list and click on the "Add" button, then the author's name will be added to the list lexicographyically ordered.