Just use the help plugin (be sure it's installed first). Settings -> Environment [Help files] is where you can manage your help files.
There's a bug in the help plugin that comes with the 8.02 release. I recommend you to install 8.02, and, on top of it, a Nightly build (the 10 March Nightly build has the bugfix, but you can also try with the 18 March one).