You can only enter information in editable fields. In card windows, editable fields have a white background, and non-editable fields are gray. In list windows, a vertical bar appears in editable fields and a dotted frame appears in non-editable fields.
To enter something in a field, click in the field. The insertion point will appear indicating that you can begin to type. When you are finished, press Enter to save. To cancel what you have written, press Esc.
Using Fields to Calculate Values