online help?

invoking online help for the following topics results in nothing useful. when i search for ‘voice’ or ‘voices’ nothing shows up about adding a voice to a musical line or how to position voices so that the stem direction is sensible. also, searching for ‘stem’ results in nothing related to how the stems of note heads can be adjusted. i know its a work in progress but these topics seem like something that should already be there for reference.

In general I find the Help extremely unhelpful.
It doesn’t seem to have any “how to do x” at all which is generally, I would argue, why you want to invoke Help.