GAS is a free Android and Apple apps that lets you connect your Garena Account and make a free spin. The spin will give you a random items in LOL. Just Click Spin to Win. Make sure to log in you Gaerna Account when you open the App for the first time.
Once you are log in. You will see a window (See Picture above). Click Spin to Win and wait for your price. It will be automatically synced in you Garena LOL Account.
You don't always get a Prize. Not everyday is Christmas Day. Sometimes you will end up Broken. But don't lose hope you'll get another free Spin in a few Hours. Be Sure to Check it out.
I will be uploading a Video Tutorial and will update this article as soon as the Video is out.