How to link dragonvale park to Facebook after already saying no [duplicate]

Looking at the FAQ section from the developers, to link Facebook to your park:

1. Launch DragonVale
2. After DragonVale has loaded, tap on Options at the bottom of the screen
3. In the Options menu, tap on Login with the Facebook icon at the bottom. You will be directed to log into Facebook
4. You will receive a prompt asking if you want to continue playing your Local park or Facebook, select Facebook. Your Local park should now be associated with your Facebook account
5. If you receive an additional prompt after selecting Facebook, you likely will want to pick the higher level park (this will only happen if you have played DragonVale with your Facebook account in the past)

It also notes that this is a permanent process and cannot be undone.