Name in the column "Type" the type of your expenses (e.g. relief projects, administration, personnel or campaining costs.)
Declare at "Value" of much you spend for this portion. You can user percentages or absolute values. (e.g. 80% relief projects, 5% administration costs)
Change the look of your piechart and look at a preview. The preview is updated automatically.
Is every correct? Then you can copy the HTML code below the form and insert it into website. Now you show you visitors what they support with their donation..