Not because why not let me link the bones to the vertices. I will tell you the steps I do.
I think any figure.
With the tool I bone a bone.
Apply vertices Pulse mode
Select the vertices
And I have it pressed <B> configured as "Add Vertices", but I do not believe me does any fractures. I have read all tutorials possible and I can not fix it. Someone can help me? This is important please.

Sorry, I speak Spanish and I used the google translate to write.