you mean you have a picture file and you used it on applet and the java sand box didnt allow you to access it so i think you must make jar file and put the picture in it or you must use http and store the picture in web and access it but if you mean you must access picture which is in client computer, i think you cant access it
in actionperformed method for jbutton2 you must first create reg field then pass it to the constructor Forma_pwlisis f2 = new Forma_pwlisis(store,reg); reg = new Register(f2); must be like this reg = new Register(f2); Forma_pwlisis f2 = new Forma_pwlisis(store,reg);