Android - How to change proxy

At the yesterday Barcamp Saigon event, I's trying to connect to the wireless network. They said that I have to change the proxy settings of the network device (my phone). They also gave me the instructions how to modify the proxy of my phone. But, they're only about iPhone, iPad, Windows... and It sucks! I use Android.

I didn't know how to change the proxy settings of my little Android back then. But, now I figured it out:

1. In the wi-fi list, press and hold your specific wireless network until the option "Modify network" popups:

2. Check "Show advanced options" to unhide the Proxy settings:

3. In the Proxy settings section, select Manual:

4. And here we go, let's change the proxy: