Changing an Exhibit Stamp to white?

My law office uses the Dynamic Exhibit Stamps Java Script created by Rick Borstein.  I need to change the properties of the stamp so that the user data input (i.e. the exhibit number that shows) is white instead of black.  I followed the editing instructions, but this don't ever work.  It only creates a second stamp that looks exactly like the one I already have. Could use some help with this.