How to edit my APN on iPhone 4S iOS 6?

So here's the story. I had installed unlockitz.co it's this thing where you can get data without Wi-Fi. And then i uninstalled it because I didn't know how to use it(dumb). And so now I can't send or receive picture and videos messages. Please help! How do i edit my APN? I need at least an expert or someone who has been through this! This is serious!

Just so you know data never had Wi-Fi to begin with. Data is an internet connection from your carrier & Wi-Fi is your internet connection from an internet service provider.

Anyways, to edit the APN is very easy.
Settings > General > Network > Cellular Data Network & there you go.

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