If you register on Zantherus using Facebook you can log in after that by logging into Facebook and then simply going on Zantherus, clicking 'Sign In' then completing your log in. To do that with an existing account, here's how. Just a warning, I did as much as I could but due to an error I can't complete the tutorial. I think it has to do with the fact that I'm an admin on the Facebook application as well and I had to remove it to make this tutorial and it didn't play nicely.
Note: You may have to be signed out of Facebook to do this.
1.) Sign in.
2.) Click on My Settings.
3.) Click on Profile
4.) Click on "Manage Facebook Connect"
5.) Click on "Connect with Facebook"
6.) Type in login information.
After this I think you should be all set, there might be some other dialog boxes after that and if there are, screenshot them and I can tell you what to do after that.
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