If Facebook login credentials haven't been set up yet, please follow this article:
1. Once the set up has been completed, the admin will need to go to Finance - Membership Plans and edit the levels they wish to grant this to.
2. Click on Additional Settings Tab and make sure this is set to YES.
3. Make sure to Save Product Details, even if it's already set to Yes.
After this is set up you will be able to see the Facebook login option throughout your website:
With this button your members can sign up using their Facebook account
As well login into their accounts with this tool:
The login will only work if the member either signed up using the Facebook account or if they log into their account and sync their profile with Facebook:
They can also Unsync their profile if they no longer wish to use this tool: