this step is not necessary ,ri
this step is not necessary ,right! i can skip it .
i can not understank " $WM_PROJECT_INST_DIR ",what it mean .
Yes, you don't need to compile
Yes, you don't need to compile OpenFOAM from source.
If you type in a terminal
and press enter, you will enter the $HOME/OpenFOAM directory. $WM_PROJECT_INST_DIR is an environment variable whose value is "/home/username/OpenFOAM".
I think you need to learn some more about Linux or UNIX operating systems. You can find many guides online (for example: http://www.linux.org/lessons/beginner/toc.html).
Google is a good starting point to find many information.
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