I'm back with a few questions (yay!)

I coded a little bit and added Antimatter to my powder toy.(i just copied it from the newest source code)

now i want to try out my PT. in the tutorial there's nothing about how to test the modded version. so i'm just asking you

btw i didn't find O2, LO2, LN2 and NICE in powder.c (neither the old nor the new source code). I geared to them in powder.h...