Making a GIF is of course the first step to having a similar signature, make.
I don't know how to do this myself so another floof may correct me if I'm wrong; but using a recording software and just recording a few seconds of what you'd like to make a GIF out of can be the first step, and then having that constantly on repeat is a very simple way of making it a GIF. Then all you have to do is upload that GIF somewhere and copy the forum sharing link into your profile.