How do we set up an APN?

[AC Question]

My data doesn't work. I've been told that it could be because i didn't set up my APN settings properly. So, basically, how do I set it up? It says I have no APN(s).

 

[B. Diddy]

Welcome to Android Central! Which phone and which carrier? Do you have a valid SIM card installed? Review this article: What is an APN, and how do I change it? | Android Central