I don't know what to do.. I want to add my NIN to my sim

I can't call Nigeria with my MTN number from United Arab Emirate and i can't even link my NIN number

please i want it open immediately

My name is Felix I want to work as and agent in the network but I don't know how to get started my phone number is 09068110059

I want to retrieve my sim,but I don't know the name arrangements if it same with my name on my nin! What do I do?do I need a biometric check before I can retrieve it