Beyond the laptop, you need a connection to the OBDII port, located under the dash above the brake pedal. Many of us who make OBD modifications use a dongle like the MX+, which is a wireless connection.So I need my laptop outside while connected to the car?
If you've got all of that already, you'll need to download a copy of AlfaOBD for around $50-60 (I don't remember the exact cost). It's a fairly straightforward interface which allows you to make vehicle configuration changes. Voicu's guide is a pretty good way to get started. If you are going to make changes, go slowly, do one at a time, and document what all you did. Last thing you want is to brick your car's computer.
The specific changes he's talking about do work with the full version with exactly the settings he listed. Make sure you clear out any error codes in AlfaOBD after you make configuration changes.