if yuou have those graphs on the net..first save them on yiur desktop..
by right clicking on the pic. and then choosing the option SAVE
go to the folder where the pic has been saved and EDIT it..
you can use any of the following applications for that purpose:
NERO COVER DESIGNER ESSENTIALS
COREL PHOTO PAINT
or whatever application u have avaiable on yr pc
then,use the various tools available there