Need help adding down arrow to gif

Can anyone let me know how to add arrows to gifs? I have photoshop and can figure most stuff out but am not sure on this one. Do I just add in a picture frame by frame? This is one of the gifs I was thinking about adding them to:

 

ttt

edited cause i might have been wrong. haven't done this in a long time.

Brilliant Phone Post

billid - edited cause i might have been wrong. haven't done this in a long time.



I missed whatever your possible solution might have been.