Under the Plans & Usage column click Telstra Air to see if your service is eligible. Click Activate and accept the Terms & Conditions.
Once you've registered you'll be able to connect to hotspots whenever you're in range.
To connect simply go to a hotspot with your computer select Telstra Air Network in your Wi-Fi settings and select connect. Then open a browser and enter your Telstra ID into the prompt that appears then follow the steps to get connected and that's it, that's how to register and connect to Telstra Air on your laptop.