Associating accounts with Facebook
To link your account to Facebook follow the below steps.
1. Click on the Linked Accounts tab in Account Settings.
2. Log into your Facebook account.
3. When asked if you've played before hit 'Yes' to link your current RuneScape account.
4. Let us know the account you want to link to Facebook.
Once this is done you can then log into game using your login details or by clicking on the Facebook icon.