Header information for all detail pages in initially entered in a "Create New" page. The plus signs near items in the system are quick links to create a new item of that type.
All fields deemed to be required by your company will be outlined in red. Make sure to thoroughly examine all other fields and checkboxes, because the settings entered here can affect how the item is used in other parts of the system.
To change or add information related to an item, you can visit it's detail page and find the edit/update "pencil" on the top right of the page. This will bring up the same "Create New" page with all information previously entered for the item.