How can I run/start a downloaded and already activated script ????

Hello experts, I think I have a simple question

I need to export an animated object (human-figure) each frame as STL

I downloaded the script from https://gist.github.com/kellyegan/fb9d710bd20579771b40. I copied it in the addon folder and could select and activate it in the “user preferences / addons”

Now I have the problem that I don’t know how to run the addon. It appears nowhere in my menue. Any Idea?

I already have loaded a figure and a bvh file with 250 Frames. Now I would like to use this export addon

Think the script says, that it should appear in “export” but I can not find it anywhere

Thanks very much, hope somebody has a useful idea