druids hut

i am on chapter 1 level 7 and cant build the druids hut
Can any one tell me how to get to bulid it please
Vill

Hi - there is a tab for the Druid's Hut on the buildings screen (first tab is for Silver-generating buildings, second tab is for Food, Wood and Stone-generating buildings and the third tab is for the Druid's Hut).