i just unlocked my phone and i want to know how to get apn settings up someone help me?

The option to change the APN settings will not appear unless you're on an unknown (unsupported) GSM network. If you're using an MVNO that piggybacks on a supported carriers network like StraighTalk or Net10, you will not get the option to change them because the phone can't tell you're not on AT&T or T-Mobile (assuming you're in the US).

If you go into Settings>General>About, what do you see where it says carrier? If there is a carrier profile there, that could be what is blocking your access to the APN settings. Even after unlocking the device, if a profile is there that restricts APN, it will stay that way until you insert a SIM that can change it. After you unlock the phone, if you put in a different SIM, did you go to Settings>General>Software update to see if there is a carrier file for that SIM provider? That could fix your issue. Otherwise, you will have to check with the new carrier about accessing the APN settings.

Only the carrier the phone is locked to can authorize unlocking it. It's unclear whether you're phone is locked to T-Mobile or O2, but whichever it is, once it's unlocked, you do not need to modify the APN settings to use T-Mobile, EE, or O2. All three are supported carriers. The proper settings are already in the phone.

How did you unlock it? Only EE can unlock the phone; once they have unlocked it you don't need the APN, just insert an O2 SIM.

You purchased an illegal product to unlock your phone. You cannot get help in an Apple hosted forum. And it probably won't work anyway. You wasted your money.

The R-SIM is illegal to use in every country on Earth. You can't get help here.