Instructions
Open up your Internet browser. Click on the address bar, and enter the address for Facebook.
Log in to your Facebook account, and click on the "Castle Age" application on the left side of the homepage.
Click on the "Quests" button at the top of the page.
Click on the green "Quest" button to begin the quest. You will use energy points to complete the quest, as well as gain experience points and gold. Carry out the quest until all your energy has been used.
Wait for your energy to be refilled. Repeat this process on a regular basis to increase your level.