I noticed that if a new user comes to my forum... and doesn't have an account... he/she doesn't have to option to use Facebook to register.... but if he/she just clicks on the login button without previously registering, they can log in via Facebook. How can I add the Facebook link to the register page?

Alternatively if this is not possible can I change the text on the register page to tell people if they want to use Facebook to login they can simply go to the login page without registering?

https://developers.facebook.com/tools/