I dont understand how it works, online there are no tutorials and the wiki is uncompleate and unclear.
Can someone do a tutorial or explain to me how it works,
any kind of help would be apriciated.

Me too
I also dont know to use use this mod with version 1.7.10
Can someone please make a tutorial, how this mod works?

Same
Every time try to add a picture it turns into something completely different:

or sometimes it looks like a bunch of squiggly lines:

Sadly this mod is fairly complicated, and I haven't got the time (or want) to go through and document everything at the moment, as I'm very busy porting buildcraft to 1.16.

However:
RedstoneFire55: The first image is what happens when there's an error with one of your loading screen json files, and there should be a description of the error in your latest log file (or directly visible in the minecraft launcher log).
The second image looks like it's rendering at the wrong scale: you've likely set the width or height to be too small?