Note where you save it, and then (as root) run the following:
chmod a+x install_pt2Install_pt2.sh
To run it, type:
./install_pt2Install_pt2.sh
The ICAO identifier for your airport in the US is the 3-letter identifier (i.e., ORD for Chicago O'Hare) with a K at the front (KORD). Pick the airport closest to you.