The program allows you to change text and images, as well as lines and charts in it. You'll only have to load the file and edit it as if you were using a common text edition tool.
It also includes a graphic edition tool in case you ant to modify any line or shape included in the document. In addition, you'll be able to add new objects, text and images to personalize it.
Choose whether to add a new picture or to substitute any one. Change font and colour, page size,... in short, modify the PDF file as if it were a doc file.