If your having some trouble getting Wifi Tethering to work, you found the right guide. After playing with my mom's new Lg Optimus, I have figured this out. Go to the Market, and search Quick Settings. It's the Green Gear icon. Install it. Open it, press the Customize button and find Wifi Tethering. Drag it to the "non hidden" section. Turn it on. Go to the REAL settings and go to Wireless & Networks Scroll down to Portable Hotspot and change the settings to how you please. Enjoy.