Remove Themes

I have installed the Journey theme via web upload through the plugin, but the files do not show up in the themes folder on the FTP. I have uploaded modified versions of Journey, but they do not work and now show up as broken themes that I would like to remove. Are they being hidden somewhere other than the Vimeography plugin folder on my site?

Ideally, I am trying to move the play button, title and line to the bottom of the main video so it feels more like a play bar.

Thanks,
-Tony

https://www.ads-software.com/extend/plugins/vimeography/