How to access my apn settings on my iphone 5?

My apn settings won't show up. I want to access them so I can get on the internet. I looked on the internet and someone sugguested restarting the network settings? Does that mean my phone would start from the factory settings again? And will my simcard still work the same as before if I restart my network settings? And will my apn settings show up as soon as I've restarted my network settings?

Check this link
http://mobileoffice.about.com/od/phonesformobileworkers/qt/How-To-Change-Apn-Settings-On-Your-Mobile-Device.htm

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