Bethany's already got a quick guide in a pinned topic on this, but we've put together a 'proper' guide which you can now find listed in the Guides section of the Worms Clan Wars community hub.

Or better yet, you could just click this handy link https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=170045023

It's a little bit more in-depth and updated than the original, and we've got a few helpful screenshots in there that should tell you what files go where in the Editor, so hopefully a few of you will get some use out of it.

Happy creating!