Getting started with STM32CubeExpansion_LRWAN

Hi everybody, I already posted a question but maybe I was too specific.

I need some help because I cannot understand how I have to incude STM32CubeExpansion_LRWAN_V1.2.2 expansion software in a existing blank project for b-l475e-iot01a2 in which it's stacked.

What folders I have to copy, what I have to configure? I did a lot of try but compilator says that always miss some files.

Is there somewhere a starting guide to use an expansion board without a specific board?

Thanks in advance,

Andrea