First of all, this race is from Small World: Be Not Afraid...
expansion, so the post should be moved there.
To answer the question: usually, when someone chooses a race, each bypassed race gets one coin from the player. Homunculi race gets one race token from the box together with a coin from the player.
That is, if stack of races looks something like:
Then to choose Orcs the player must put one coin on Amazons and one coin on Dwarfs. If Homunculi race is in place of the Dwarfs, then to choose Orcs a player must additionally put a homunculi token from the box on homunculi race.
I hope this makes things more clear. Otherwise, just ask