If Help is installed, type:-
-F1 to call for Help:
Or if you prefer, you can also display it by using the menu on the Control Panel:
However, if Help is not installed and you type F1, you will get a message something like this:
If you have attempted to install Help and you get a message similar to the above, it could be that you have installed it to the wrong folder. It needs to be installed to the sub-directory "help" of the program folder, wherever you have decided to install it (not necessarily at "C:\rubber" as shown in the example above), and as you see the name of the file is (and needs to be) "rubber_help.chm". Windows recognises this as a special type of executable file. If you haven't yet downloaded it, you can get it at http://www.howsoft.com/downloads/.
Installing RD-D Help