Removing a subtitle source after installed?

Hello all...

I have searched everywhere but cannot find a way to remove a subtitle once it has been added to the list in Kodi available sources for external subtitles.

There is a particular one that is always causing the machine to hang and I would like to remove it as simply as possible. The source is called "subcentral.de"

Any one know of a way to get this off my machine without major overhaul? I'm still using Isengard 15.2 on OE 6.0.3

Thanks in advance

Pete