Please follow those steps:
Tap on 'Continue with Facebook'
Tap on the button ''Continue as...'' to proceed
If your Lifecake email address and your Facebook email address don't match, please change your email address to the Lifecake one so you don't create an empty account.
Once you have changed your email address, tap on 'Next'.
If your Lifecake and Facebook email addresses are the same or you are registering for the first time, simply just click on 'Next' to proceed.
You will shortly receive an email containing a magic link so that you can verify your account. Please tap on 'Sign in to your account' to access your account.