Hi, in my dragon city, if i try to sell a dragon i can't beacuse, like said in the head, the "sell" button that you could normally find when you click on the habitat then on the dragon that you want to sell, doesen't appear.
What have i to do?

This is not a Bug, you have to be a minimum level in order to start selling dragons. So level up.

@cristian-migliore You have to be level 10 to be able to sell dragons.