Samsung calendar wrong sync email address new galaxy S5

[AC Question]

So I went to sync my calendar to my outlook acct. It's listed as my facebook acct email an its the wrong email acct not even associated with facebook. So It wont let me add it as a microsoft exchange calendar because it says acct already exists. How do I delete the existing facebook calendar,log it in with the right email address for facebook sync that and then add my outlook calendar and sync that. Any help would be great