How to use Fizz sim as sim number 2?

I tried to use my Fizz sim without any success. I own an Asus Zenfone 3 Laser with dual sim slots, sim 1 (micro) and sim 2 (nano). I hope to use sim 1 for voice and sim 2 for data. The phone "sees" the Fizz sim (i.e. sim 2 is available) but I cannot use it. I did not receive any text for configuration purpose. I tried to configure the APN settings but strangely some fields are grayed out. I appreciate very much your help to get the Fizz sim working.


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