1.all you got to do is open photoshop make your design
2.go to window
3.click animate/ animation
4.then click the new layer button on the new window
5.then make you second slide
6.then add more slides if you wish
7.then change the time diffrence if needed
8.to the bottem left of the corner you cant test the animation
9.after your happy with it go to file save for web then click save
10.and you have a animated signature