NJOY2016 steps after compiling

if I already compile the NJOY2016 file what should I do next ?

Hello, what do you mean by the “NJOY2016 file”? I assumed you just compiled the source code so that you can use from_njoy() method to generate the neutron data.

You need to put the njoy binary into your PATH environment variable, so from_njoy() can use njoy.