Game says to click on a village, then on attack. But I still don't see anything to use the Master of Loot option. I have 9 now in Inventory, waiting to be used.
Yes, you have to click on "send army" button in the village menu, and than you can choose between several commanders. If you cant see them, I recommend you to change your screen resolution, because some game element cannot be seen in big screen resolution. Try ctrl and + or ctrl snd -