Help with Application Install - needs command line input

I've just installed the BRL-CAD application and it need a command line input ( /usr/brlcad/bin ) to the System - see below.

I am not that familiar with the commands although no problem getting into the Terminal. I just don't want to screw this up. I am running a Mac Mini, 2.66 Ghz Intel Core 2 Duo, 4 GB RAM, OS 10.6.5. I would greatly appreciate some step-by-step help in getting this embedded and the application up and running.

Setting Up the Path:
Once installed, you will need to add /usr/brlcad/bin to your system
PATH. For Bourne shell users, you can run the following:
PATH=/usr/brlcad/bin:$PATH ; export PATH
For C shell users, this should do the same thing:
set path=( /usr/brlcad/bin $path ) ; rehash

Thanks! JAYGEE

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