How do I sync new events added to my eM Client calendar with my iPhone 6?

Now I cannot get anywhere in eM. It keeps asking for passwords for CardDav, CalDav and IMAP none of which I have. Also getting dialogue boxes saying Password required Server says “ “ etc

Unfortunately you cannot connect to an online service without a username and password. Your provider will have some facility to reset the password, if you have forgotten it.

I understand that bit and I have no problem getting into eM.  However, once in, I can’t do anything without entering passwords for the other items detailed previously - these items I do not comprehend and can be certain I have never set passwords for in the past.