I'm sorry to say, but there are no help files by now. The manual was removed because of copyright issues with QCAD. The only way to fix this is to do it from scratch. If you can help, you are welcome.
To get help find useful links on our homepage
http://librecad.org/cms/home/get-help.html. In our
Wiki, which is linked there too, you will find a
manual site and other helpful topics.
Armin
investing less than half an hour into Search function can save hours or days of waiting for a solution