Problem of setting environment variables for installation of OpenFOAM-8

I followed the instruction on website to install OpenFOAM-8 with Ubuntu 18.04 LTS, every step was great until the setting of environment variables. Like the website instructed I tried to add the following code to $HOME/.bashrc file, this was what I done:

 vim .bashrc

and then added these code into bashrc file at the bottom,

 source $HOME/OpenFOAM/OpenFOAM-8/etc/bashrc

Here is where I felt somthing wrong...Without any indications or prompts after I finished. I then saved and quit the vim, and type this in the terminal window, nothing happened also:

 source $HOME/.bashrc

I just followed the instruction and moved to the compiling of OpenFOAM section, I typed ./Allwmake in OpenFOAM-8 directory it gived me:

 ./Allwmake: 22: ./Allwmake make: not found

I also tried sudo ./Allwmake, it gived me:

 Allwmake error: The OpenFOAM environment is not set. Check the OpenFOAM entries in your dot-files and source them.

So I think the problem must in the setting environment variables section. Could anyone tell me how to solve this please?

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