Hi Reza,
I'm not 100% sure what kind of animation you mean. juSBGN/biographer does not support animation directly. If you want to move nodes this can only be done programmatically accessing the biographer UI library. The nodes shown a svg objects, and you may be able to animate them trough css, but the corresponding data element wouldn't be updated then.
to move programatically you would need to do
graph.drawables()['nodeid'].position(x,y)
in biographer editor:
editor.graph.drawables()['nodeid'].position(x,y)
.position()
will get the current position
I hope i could help you a bit,
all the best,
Thomas