bsurfaces add-on guide?

This question is related with Bsurfaces manual.

Hello Blender artists.

I recently began studying Blender.

Then I saw that in a blender cookie tutorial using Bsurfaces-add on retopology

I bsurfaces-add on I wanted to try out, I could not find the manual

I was not able to connect to the

Do bsurfaces-add on’s guide or manual to see where?