How do you unlock attacks on dragon city?

To unlock attacks in Dragon City, you need to level up your dragons and ensure they have reached at least level 4. Once they reach this level, you can assign them to a battle team by placing them in the battle slots. Additionally, make sure you have sufficient food to feed your dragons and level them up further, as higher levels unlock more powerful attacks. Participating in battles and completing quests will also help you gain experience and unlock additional attack options.