Catalog configuration: Fields
On your catalog page, click Configure catalog button.
The page which opens displays a number of configuration options for the catalog, including access, privacy and sharing (described further), and field configuration. The field configuration block is at the bottom.
To add a field, use Add field button. Choose a name for it, select its type, and save it by clicking a tick mark button to the right.
Fields can be changed or deleted by hovering over them and clicking a small gear or trash icons at the right. They can be also rearranged by dragging.
There are a number of settings for different field types. An advanced mode is toggled by Advanced options link which shows even more settings. To get explanation of an option, click a small question icon next to it.