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I’m undecided

What is the Unix command to change $HOME?

In "Developing Web Applications with Haskell and Yesod", on page 9, 2nd paragraph it states:
On Mac and Linux, this will be $HOME/.cabal/bin"
Can someone tell me what Unix command to use to change my $HOME to what the author states. Currently, my $HOME is /Users/userName?
Also, what does .cabal stand for?
I apologize for being a Unix newbie, but I would appreciate any help.
Thank you
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