To launch the program with the graphical user interface simply use
the shortcuts created by the installation process in your main menu or
desktop, if instead you are using a terminal to launch it simply don't
pass any argument to it, or if you want to pass a pdf file to open at
startup use the syntax:
jpdfbookmarks --gui file.pdf
or:
jpdfbookmarks file.pdf
In this section we will explore the possibilities
offered by the program to create different kind of bookmarks or modify
existing ones.