I need help with Zombie Farm 2....

I've tried several times to make a Robo Zombie, Zombielocks and an Imp Zombie. I am stuck and can't move on in the game until I figure this out. I know you have to keep trying with your zombie pot. I just am not sure if I am getting the combinations right. I've read so many different ones for the same thing... Could someone PLEASE give me a clear answer on how to make each one please? I would appreciate it so very much! And thanks in advance.
Zombie Farm 2
Captain Zombie
Admiral Zombie

Just Another Zombie!