How to change the apn settings for the iphone 4 ios6.0?

Please i need some help… I have the straight talk sim card and in order to enable the data usage on the phone, i have to adjust the apn settings and i can't figure out how to do it.everyone is saying to go to the "network" tab but i do not have that tab. The phone is unlocked and i can make and receive calls through straight talk now but i can't use the data without Wi-Fi… Please how do i change the apn settings?

Added (1). Is there any way to do it without jailbreaking though? I don't know how to do that and i don't want to destroy the phone by trying to do so

Jailbreak

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