How to switch to my Wi-Fi on my Iphone 4s?

I just got an Iphone today and I have to clue on how to change it from the 3G data to my home network. How?

Go to settings, cellular, and turn cellular data on/off. (iOS 7)
As for iOS 6, I'm not too sure. Just go around settings, and anyways, if you're connected to Wi-Fi and have 3G on, you won't use 3G.

Just go to settings<Wi-Fi< and click the bar to turn on green. The iphone will automatically use Wi-Fi (if available) over your 3G.

Go to settings, then click Wi-Fi, then change the slider at the top to ON. This should work.

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